Hello,
You should go to the Library's Databases.
Start by going to the library's homepage: www.bhcc.mass.edu/library. This page is also linked to on every page of the college's website, under Student Resources by clicking on Library.
After that, click on the purple Databases square. This will bring you to the databases page: www.bhcc.mass.edu/library/databases
Once there, you will see a few places that you can go. Since you don't know which resource to use, you would want to find a database using the By Subjects tab.
Under By Subjects, you could click on General or Points of View Databases. Within these, you will find some databases that could be useful, and then you would put your search term within just as if you were doing an Internet search.
You could also look under By Course Subject and use the databases under Psychology.
You should not have any issue finding three sources if you use a database within one of these sections.
Andy