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This page is a translated version of the page Help:Sources and the translation is 14% complete.

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Majoriteten av uttalanden på Wikidata bör vara verifierbara och styrkta av källor som böcker, vetenskapliga publikationer eller tidningsartiklar. På Wikidata används referenser för att peka på specifika källor för att styrka datan i uttalandet.

Referenser består, liksom uttalanden, av minst ett par av typen egenskap-värde (för referenser är värdet källan). Källan utgörs vanligen av ett av de två alternativen: stated in (P248), som refererar till publikationer och media, och reference URL (P854), som används för webbplatser och databaser.

Den här riktlinjen förklarar när en källa krävs för att styrka ett uttalande på Wikidata. Den förklarar också hur en källa bifogas till ett uttalande.

Språkoberoende generella principer[edit]

När en källa behövs[edit]

Wikidata är en samling data hämtad från diverse källor, vilket betyder att de flesta uttalanden bör ange var datan stammar från.

I vissa fall är källor inte ett krav:

  1. När ett värde är allmän vetskap, och det inte är omtvistat eller kontroversiellt. Till exempel är det allmän vetskap att Europe (Q46) är en instance of (P31) continent (Q5107).
  2. När ämnet har ett uttalande som refererar till en extern informationskälla, som en databas eller en autoritetskontrollfil, som tillåter enkel verifikation av uttalandet. Till exempel behöver Harry Potter and the Philosopher's Stone (Q43361)s GND ID (P227) (en autoritetsfil som sköts av tyska nationalbiblioteket) inte styrkas av en källa eftersom värdet, 4615979-4, är en direktlänk till den aktuella sidan på tyska nationalbiblioteks webbplats.
  3. När själva ämnet är källan för uttalandet. Det är till exempel för bokserien The Hunger Games (Q11679) möjligt att säga att author (P50)n är Suzanne Collins (Q228624) utan att ange The Hunger Games (Q11679) som källa för påståendet.

För mer information, se ämnen som inte behöver källor.

Adding a source to a statement[edit]

example of a sourced statement

There are four basic steps to follow when adding a source regardless of the type of source being added.

  1. Check if an item for the source already exists in Wikidata using the Item by title search
  2. Add the source as an item if: i) it's not in Wikidata already and ii) it is not a webpage
  3. Add a reference to your statement and point to the source item. For source items in Wikidata use the property stated in (P248); for sources that exist online outside of Wikidata, use reference URL (P854)
  4. Add the source and all necessary qualifiers

More information on searching for and creating items can be found at Help:Items.

Different types of sources[edit]

References should point to reliable sources of information such as university-level textbooks or reference books, academic journals, and newspapers. For more information on identifying reliable sources, please see Wikidata:Verifiability.

Please note that while pages on Wikipedia (and other Wikimedia sites) should and can be added as sitelinks, they are not appropriate as sources for Wikidata statements. As per the Wikipedia policy on verifiability, the content of articles in Wikipedia must be verifiable; it should be supported by sources also (in the form of citations). However, just because something is stated on a Wikipedia page, does not mean that it is acceptable to consider the Wikipedia page itself as a source; it's much better to locate the actual citation and use that instead. For this reason, statements that are only supported by "imported from (P143)" are not considered sourced statements. If you encounter one of these statements, please remove "imported from" and add a more reliable source.

This list is not complete and types of sources in addition to the ones found on this page may be reliable; if you would like to add a new section with instructions on how to add such sources, please do so.

Books[edit]

In Wikidata, books are treated according to the Functional Requirements for Bibliographic Records (Q16388) (FRBR) model, a commonly used conceptual framework in library science.

Without going into too much detail, the FRBR model allows us to make a distinction between creative works, and their different editions or translations; in Wikidata, these are known as work items and edition items respectively. For example, we can say that Hamlet (Q41567) and Bible (Q1845) are work items, while Hamlet, Prince of Denmark (Q14422206) and the King James Version (Q623398) are edition items.

When sourcing statements, you should only ever use the edition item of a book. In some cases, it will be necessary to first add the work item to Wikidata in order to create an edition item. You can do so by following the steps below:

  1. Check if the work item already exists in Wikidata. If an item is found, proceed to step 4. If the item is not found, create a new one for it and go to step 2.
  2. Add at least the following statements to the work item:
  3. Add any additional properties to the work item that may seem necessary, for example:
  4. Check if the edition item of your work item exists in Wikidata. If an item is found, proceed to step 8. If the item is not found, create a new item for the edition and go to step 5. Make sure to label the edition item in a way that can be differentiated from the work item
  5. Label the new edition item in a way that can be differentiated from the work item by adding the edition number with the title
  6. Add at least the following statements to the edition item:
  7. Add any additional properties to the edition item that may seem necessary, for example:
  8. Return to the item page you were adding a reference to source your statement with stated in (P248) and link it to the edition item
  9. Add any additional properties to the reference section which can help when verifying the value of the statement:

Example:

Work item: CRC Handbook of Chemistry and Physics (Q904273), edition item: CRC Handbook of Chemistry and Physics (92nd edition) (Q11927173)
Used to source statement: CAS Registry Number (P231) of ethanol (Q153)
Reference: stated in (P248)CRC Handbook of Chemistry and Physics (92nd edition) (Q11927173)

Scientific, newspaper or magazine article[edit]

Publication articles require that both the publication and the article be added as items to Wikidata (if they haven't already been).

  1. Check if the publication item already exists in Wikidata. If an item is found, proceed to step 3. If the item is not found, create a new one for it and go to step 2.
  2. Ensure that at least the following statement is added to the publication item:
  3. Check if the article item exists in Wikidata. If an item is found, proceed to step 5. If the item is not found, create a new item for the article and go to step 4.
  4. Ensure that at least the following statement is added to the article item:
  5. Return to the item page you were adding a reference to source your statement with stated in (P248) and link it to the article item.
  6. If needed, return to the publication item and add additional properties:
  7. If needed, return to the article item and add additional properties:

Example:

Journal item: Geological Society Special Publication (Q15817216), article item: The age of the Earth in the twentieth century: a problem (mostly) solved (Q15545344)
Used to source statement: inception (P571) of the Earth (Q2)
Reference: stated in (P248)The age of the Earth in the twentieth century: a problem (mostly) solved (Q15545344)

Reports, policy, legislation and technical documentation[edit]

  1. Check if the document item exists in Wikidata. If an item is found, proceed to the step 3. If the item is not found, create a new item for the edition and go to step 2.
  2. Ensure that at least the following statement is added to the document item:
  3. Return to the item page you were adding a reference to source your statement with stated in (P248) and link it to the document item.
  4. If needed, return to the document item and add additional properties:

Example:

Legislation item: Civil Marriage Act (Q3258612)
Used to source statement: start time (P580) of same-sex marriage in Canada (Q17447)
Reference: stated in (P248)Civil Marriage Act (Q3258612)

Web page[edit]

  1. Check if the web page item exists in Wikidata. If an item is found, source your statement with stated in (P248) and link it to the web page item. If an item is not found, do not create one for it; instead proceed to step #2
  2. Source your statement with reference URL (P854) and link it to the URL of the webpage
  3. Add the following qualifiers to your reference so the source can be tracked down if the URL changes:
  4. If needed, add additional qualifiers:
    • author (P50) and publisher (P123). Please note if the web page belongs to a major web site that already has an item in Wikidata, you should use publisher.
    • quote (P1683) → exact quotation of text from the webpage

Examples:

Web page item: United States Population Clock (Q3398022)
Used to source statement: population (P1082) of United States of America (Q30)
Reference: stated in (P248)United States Population Clock (Q3398022)
Non-web page item
Used to source statement: date of birth (P569) of Giambattista Bodoni (Q220768)
Reference: reference URL (P854)http://www.treccani.it/enciclopedia/giambattista-bodoni_%28Dizionario-Biografico%29/

Databases[edit]

Please note: this approach only applies to databases that already have a corresponding property defined in Wikidata. The property is often an identifier unique to the database such as the PubMed ID (P698) for PubMed or the IMDb ID (P345) for the International Movie Database. Consult the list of properties for authority control IDs to determine whether the database property has been added to Wikidata. You can also use the advanced options of Special:Search to search for the database and/or its identifiers in the Property namespace. If no such property exists for the database, treat the database as a webpage (see above).

  1. Search for the database item in Wikidata. If an item is found, proceed to the next step. If the item is not found, create a new one for it.
  2. Ensure that at least the following statement is added to the database item:
  3. Return to the item page you were adding a reference to source your statement with stated in (P248) and link it to the database item.
  4. Add the following qualifiers to your reference in order to indicate the specific register of the database.
    • database property → database property ID (the unique identifier for the data as per the database)
    • title (P1476) → the title of the dataset in the database
    • publication date (P577) → the publication date for the data. If no publication date is provided use retrieved (P813), the date when the data was taken from the database

Example:

Database item: PubChem (Q278487), database property: PubChem CID (P662)
Used to source statement: InChI (P234) of ethanol (Q153)
Reference: stated in (P248)PubChem (Q278487)

Media & Entertainment (TV/radio/music/video)[edit]

  1. Check if the media item exists in Wikidata. If an item is found, proceed to the next step. If the item is not found, create a new one for it.
  2. Source your statement with stated in (P248) and link it to the media item
  3. If needed, return to the media item and add additional properties:

Example:

Documentary item: Man on Wire (Q1417721)
Used to source statement: occupation (P106) of Philippe Petit (Q705289)
Reference: stated in (P248)Man on Wire (Q1417721)

Guidelines for sources in English[edit]

  1. Till July 2014 the more general term part of (P361) was in use.

See also[edit]

Wikidata property to indicate a source (Q18608359)For related Help pages, see:

For additional information and guidance see:

  • Project chat, for discussing all and any aspects of Wikidata
  • Wikidata:Glossary, the glossary of terms used in this and other Help pages
  • Help:FAQ, frequently asked questions asked and answered by the Wikidata community
  • Help:Contents, the Help portal featuring all the documentation available for Wikidata