To evaluate a website, you must determine its credibility.
Ask yourself "Is this CRAP?"
Currency: When was the page created & updated? (Copyright year)
Reliability/Relevancy : What references does this site provide? (Links)
Authority: Who created this site? (.edu, .gov, .org, .com)
Purpose: Why was this site created & is there bias? (Advertising)
PubMed Central (PMC) is the U.S. National Library of Medicine's digital archive of biomedical and life sciences journal literature, providing free access to the full text of articles.