The quality of the information you find on the Web varies tremendously so it is always a good idea to check the information against another source. As with all information resources, whether in print or on the Internet, you evaluate its quality based on the following criteria:
.com - commercial business
.net - network organizations
.org - organizations (nonprofit)
.edu - educational institutions
.gov - government agencies
.mil - military
.ca.us - state government
Evaluating information on the web can be done by just looking at the URL. Reliable websites to use for academics generally end in .edu, or .gov.
Examples:
www.laspositascollege.edu/library/documents/LPCplagiarism_examples.pdf