To limit your search to authoritative (trusted) sites:
Specify a preferred domain (.edu, .gov or .org) by adding site:.domain to your search.
"bipolar disorder" site:.org
Be sure to include NO spaces between site: and the domain.
Use quotation marks:
For natural phrases (compound terms), such as bipolar disorder or attention deficit disorder, be sure to use quotation marks.
Example: "bipolar disorder"
Compare commercial websites (.com) with government, educational, and organizational websites (.gov, .edu, .org). Here are some evaluation methods: