Find a reference source (a bibliography, literature review, encyclopedia or handbook) that relates to your topic (usually more broadly)
To find books, search the library catalog by keyword or known title. Note subject headings in records for the more relevant titles and follow those subject heading links.
To find articles, search a discipline-specific databases, e.g., Worldwide Political Science Abstracts, or a broader interface covering multiple disciplines, e.g., the Articles & Full Text search from the library homepage.
Track references from highly relevant articles. What sources did those articles cite? What later sources cited those articles?