Three databases that specialize in peer-reviewed articles are:
Academic OneFile (Gale)
Research Library (ProQuest)
(Check the box marked Peer reviewed.)
Academic Search Premier (Ebsco)
ALL Databases offer the ability to Download Full-Text Articles and APA Citations.
Be sure to download the full text of all articles you wish to use for your paper, and be sure to download and save the APA 7 citation for all articles you download.