MLA

Kissinger, Henry, 1923-2023. Kaplan, Morton A., "Some Problems in the Strategic Analysis of International Politics". Box 288, folder 6. 1959 January 12. https://collections.library.yale.edu/catalog/11787180.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 288, folder 6"])(1959 January 12)[Kaplan, Morton A., "Some Problems in the Strategic Analysis of International Politics"]. https://collections.library.yale.edu/catalog/11787180.