You can limit the results of your search by using Google advanced search. Enter .gov or .edu in the site or domain box.
BEFORE YOU USE INFORMATION FROM THE WEB, EVALUATE THE SITE!
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?
The domain tells you the source of your website.
.EDU = college or university
.GOV = government agency
.COM = commercial website
.NET = network
For reliable information, look for sources with .edu or .gov endings.