Hi,
The item A Dictionary of Māori Computer Related Terms (Q54678767) is quite empty and seems to be about the works. Could you create items for the editions per Wikidata:WikiProject Books model ? at least for the second edition you used on Lexeme:L2222 (and consequently, we can remove the qualifiers edition number (P393) and publication date (P577) on L2222).
And is the second edition the one at this URL http://www.taiuru.maori.nz/publicationslib/Dictionary-of-Computer-Related-Terms-Edition-2.pdf ? If so, mamati seems to be at page 78 not 79 ;)