Check the author's credentials before relying on information of this sort. Someone willing to put his or her name, credentials, affiliation, and contact address on an article is more likely to be reliable than someone making an anonymous posting to the Web. If you find the same information in reliable print sources as you do online, the potential for accuracy is higher. If these are print references, they can be validated the usual way. If they are links to other Internet documents, you're back at the starting point in validating the new reference.
Many Web sites contain links to other documents or sites on the Web.
Follow a few of these links to see what kind of information the author associates with. If you notice the use of bad grammar or misspelled words in a web site, it is a sign for caution. Whether the errors come from carelessness or ignorance, neither puts the information or the writer in a favorable light.