MLA

Kissinger, Henry, 1923-2023. "The Relation between Force and Diplomacy," National Military-Industrial Conference, Chicago, Illinois, Mar 14, 1957. Box 241, folder 8. Circa 1957 March. https://collections.library.yale.edu/catalog/11786355.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 241, folder 8"])(Circa 1957 March)["The Relation between Force and Diplomacy," National Military-Industrial Conference, Chicago, Illinois, Mar 14, 1957]. https://collections.library.yale.edu/catalog/11786355.