Review your sources to see if the materials found are:
o Relevant: By studying the books' table of contents or by reading the article's abstract.
o Current: By checking the date of publication. Topics in the sciences usually require information that is current.
o Written for an appropriate audience: By examining the body of the source to see if it is too elementary, too technical, too advanced, or just right for your needs.
o Authoritative: By finding out the author's credentials and publisher's reputation. Example: Has your instructor mentioned this author? Was the author cited in other sources or bibliographies? Were the articles published in scholarly or peer-reviewed journals that require certain criteria to be met before publication?