As previously mentioned, you must refer to at least one outside source other than the text that deals with the disorder you discuss. The source or sources must be from a reputable source with an author listed, preferably from a book on psychology, or an article from a psychology website or psychological journal (no Wikipedia, about.com, yahoo.com, etc.).
You must provide the source references in order for the instructor to check the source. If you have doubts about the reputability of the sources, check with the instructor. Also, please refrain from plagiarizing the source material. Students who plagiarize will receive no credit for the assignment. If you are unsure about how to avoid plagiarism, ask the instructor for clarification. Finally, please keep in mind that this is a formal essay and should include a reference page, proper formatting and attention to grammar, punctuation, spelling, and sentence construction.