MLA

Kissinger, Henry, 1923-2023. Issawi, Charles. Box 161, folder 22. 1960 April. https://collections.library.yale.edu/catalog/11785211.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 161, folder 22"])(1960 April)[Issawi, Charles]. https://collections.library.yale.edu/catalog/11785211.