MLA

Kissinger, Henry, 1923-2023. Rusk, Dean. Box 98, folder 17. 1961. https://collections.library.yale.edu/catalog/11784089.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 98, folder 17"])(1961)[Rusk, Dean]. https://collections.library.yale.edu/catalog/11784089.