Your textbook is a great starting place but if you are interested in exploring beyond this, check out topics in the following sources, or browse the journals for ideas. Be sure to keep in mind that your topic needs to fall into "social" psychology.
Google search for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports on all topic areas. Use to find articles from academic publishers, professional societies, prepublication repositories and universities.
Coverage: Varies Full Text: Yes
While gathering general information and facts...
Make a list of keywords and add to this list as you find more
Follow up on relevant authors, researchers, expert
Gather statistical information to build scope and impact of problem
Consider all perspectives: historic, economic, social, political, etc.