The third type of research source you're asked to find a website from a US government agency, or from a college or university.
Government agencies and colleges/universities regularly publish reports, research studies, data sets, and other sources of information.
To do:
(For reference, here is an APA citation guide from the Online Writing Lab (OWL) at Purdue University.)
Example searches:
Note about restricted domains:
The .gov domain is restricted to use only by US government entities. They may be at the local, state, or national level.
The .edu domain.is restricted to use only by colleges and universities. They may be from any country.
There are some rare exceptions to the restrictions above. If you find a questionable website, consult with your instructor or a librarian.