What information can you find on the author/publisher/source/sponsor from trustworthy sources?
What are the author's credentials or organizational affiliations?
What are the author's qualifications to write on the topic?
Be wary about judging a source by its URL domain (e.g., .com, .org., etc.). While many think that sites ending in a .org are more credible than those ending in .com, in actuality they are not--anybody can purchase a .org domain.