Describe the various kinds of books stored in libraries. Which are the most credible and why?What are some factors that lend some popular sources more crediblity than others?

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Describe the various kinds of books stored in libraries. Which are the most
credible and why?
What are some factors that lend some popular sources more crediblity than
others?
Who is sponsoring or hosting the site? Is it hosted by a credible organization such
as research institute, university, or government agency?
Does the site send up any warning flags in the areas of tone and style? Do you
see any emotional language or other signs of bias? Does the site look as if it was
professionally designed and edited?