MLA

Kissinger, Henry, 1923-2023. Sa. Box 52, folder 18. 1957-1968. https://collections.library.yale.edu/catalog/11783380.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 52, folder 18"])(1957-1968)[Sa]. https://collections.library.yale.edu/catalog/11783380.