The resources on this "Getting Started" page are great for finding definitions and overviews of psychological topics. They are great starting points! Then dig a little deeper by looking for books and journal articles using the "Books" and "Journals" links.
Why use these "reference" or "background" resources?
The DSM-V is a great place to start your research, because it provides overviews of mental disorders.
Complete Diagnostic And Statistical Manual Of Mental Disorders, Fifth Edition.
Credit: The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. Sigmund Freud. Retrieved from http://digitalcollections.nypl.org/items/510d47df-bf4f-a3d9-e040-e00a18064a99