MLA

Kissinger, Henry, 1923-2023. "Problems of American Foreign Policy," Rockhurst College, Nov 12, 1961. Box 248, folder 20. 1961 October-1962 February. https://collections.library.yale.edu/catalog/11786491.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 248, folder 20"])(1961 October-1962 February)["Problems of American Foreign Policy," Rockhurst College, Nov 12, 1961]. https://collections.library.yale.edu/catalog/11786491.