See what has already been asked, researched and answered. Do not forget to check with the reference librarians at your university, college or local library. They can help you use the library, including how to narrow your search terms to do a focused search either of the library's catalog or the Internet. Next, check to see which journals are in your local or university library. Some journals will be on cd-rom, some on microfiche, some in other electronic formats, some in print.
Most journals end the volume or year with a listing of previous articles.
Some journals are on-line and some have searchable abstracts. Here is a listing from Jim Boskey, The Alternative Newsletter, of the most important journals in the field. The Journal of Conflict Resolution, Sage Publications, P.O. Box 5084, Thousand Oaks, CA 91359-9924. You can also look for preliminary information about your topic in an annotated bibliography. Every fourth edition is the annotated bibliography edition.