Google's advanced search allows you to search by domain name (on bottom line of the advanced search form).
Entering .edu, .gov or .org into this line will only return results from educational, organizational or US government sites. You will still have to evaluate the sites for authority, accuracy, currency, and objectivity.
Google Scholar eliminates the commercial parts of Google and points to more scholarly information.
Use critical thinking skills and evaluate the websites you find.
A multidisciplinary database of more than 8,500 fulltext periodicals with pdf content going back as far as 1887. Includes indexing and abstracting for more than 12,500 periodicals.
An online digital library of education research and information, sponsored in part by the U.S. Department of Education. Coverage dates 1966-present
An academic version of Google providing a simple way to broadly search for scholarly literature. Coverage dates vary.
One stop for searching. Find articles, reports, books, and more.