An effective research strategy is to consult the reference lists and bibliographies of books and journal articles that you find; these bibliographies should help you identify other valuable materials on your topic. Your next step is to determine whether KL owns that book or journal article.
e.g.: Suppose you find the following citation in the bibliography of a book or article you're reading:
Bernstein, B. J. (1998). Truman and the a-bomb: Targeting noncombatants, using the bomb, and his defending the "decision." Journal of Military History, 62(3), 547-570.
Check to see if KL owns this journal (Journal of Military History) by searching Kresge Library’s Library Catalog. (Be sure to perform a Journal Title search using the title of the journal — Journal of Military History — NOT the title of the article.) If Kresge Library does not have this article, you can order a copy through Interlibrary Loan.