There are 3 American Psychological Association (APA) databases that will provide you with citations and full-text for authoritative literature on your topic. All three databases use the ProQuest platform:
PsycINFO provides citations and abstracts to scholarly journal literature. Some full-text is available. Journals from a variety of publishers, both national and international, are indexed here.
PsycBOOKS provides citations to scholarly books, and the electronic texts of the books are available.
PsycARTICLES provides full-text access to scholarly journal literature published by the American Psychological Association. While everything here is full-text, it incudes fewer journals (yet those journals are of high quality).
The NIMH is the lead federal agency for research on mental disorders.
NOTE: These news stories are summaries and will not count as a primary source reference. You can, however, track down the references cited at the end of the article; those will count as primary sources.