Before you use material from the Internet, evaluate the site by asking:
WHO- is the author or sponsor ? Is it a reliable person, site?
WHAT- information is provided ? Does it match other information from valid sources?
WHEN- was the information posted/updated ? Is it current?
WHERE- does the information come from? Is it a reputable source such as .edu or .gov?
WHY- is the information there? Is it there to inform and educate without bias?
Find out more about credible sources in this tutorial.