Here are some basic criteria's to follow

Authority

* It is very important to be able to connect the ideas viewed in a web page to a particular author, organization, or business. Once you have found out who is responsible for the pages content you can then move on to see if that person has the credentials to be trusted on the subject.

*Look at the domain and url of the page. This will give you additional information on who is sponsoring the page. If the page is a edu, org, or gov, but it is also important to note that just because the page is hosted by an organization, it does not mean the sponsors is responsible for the content of the page. For example, most universities will host student and faculty personal web pages so be sure to carefully evaluate the content.

*Look for the Author's credentials, is the author of the page qualified to post a page on this topic. Be wary of pages about research topics without a stated author or organization. Look for the person's educational credentials; people who have worked hard to get their degrees usually will not hesitate in showing them off. Also look for references to current positions held and pervious work experience. I know it sounds like you interviewing the person for a job but its important to see if the person really knows what they are talking about. Much of the Internet is commercial in use so people sometimes create pages under the gies of medical research when their version of medical research is designed to sell a product. When you have found a really good reference page all of these points will be easy to find.