What is background information?
Background information, or reference information, is the type of information you could get from Wikipedia. These resources will give you trustworthy overviews of a topic and provide you with basic things like dates, events and facts about your topic. Generally, you can think of this information in terms of the who, what, where and when of a topic.
Where to Find Background Information
The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-V) is the standard classification of mental disorders used by mental health professionals in the United States.
The UHV Library has a few copies of the DSM-V. You can use it by coming to the library and asking for it at the Ask a Librarian Desk.