To locate books and graduate student theses, start with the following resources:
HOMER- the online catalog of the USC Libraries. Search for books, USC theses, dvds, and journals (but not individual journal articles).
Worldcat – a collective online catalog that encompasses academic and research libraries in the United States and some foreign research libraries, as well.
Proquest Theses and Dissertations – this provides access to US theses and dissertations, many in digital format.