MLA

Kissinger, Henry, 1923-2023. "The Nature of the Current Struggle," National War College, Aug 31, 1961. Box 248, folder 12. Circa 1961 September. https://collections.library.yale.edu/catalog/11786483.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 248, folder 12"])(Circa 1961 September)["The Nature of the Current Struggle," National War College, Aug 31, 1961]. https://collections.library.yale.edu/catalog/11786483.