MLA

Kissinger, Henry, 1923-2023. Erlich, Alexander. Box 161, folder 11. 1960 January-February. https://collections.library.yale.edu/catalog/11785200.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 161, folder 11"])(1960 January-February)[Erlich, Alexander]. https://collections.library.yale.edu/catalog/11785200.