Authority - Find out who's telling you the information, an expert or scholar?
Source - Who's the publisher or entity responsible for presenting the information?
Coverage - Is it scholarly (look for footnotes and/or a bibiliography) or popular?
Who's the intended audience? (Check the vocabulary, language and tone.)
What's the depth/scope?
Accuracy - Are the facts, names, dates, etc. correct?
Objectivity - Is there a bias or particular viewpoint?
Date - Is it recent? (Is that relevant?)
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From the Art Library’s homepage (http://www.lib.uiowa.edu/art/ ) search these:
Databases such as ArtFull Text+Art Index Retrospective, Avery Index, JSTOR
Grove Art Online