MLA

Kissinger, Henry, 1923-2023. St. Box 502, folder 3. 1975. https://collections.library.yale.edu/catalog/11778626.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 502, folder 3"])(1975)[St]. https://collections.library.yale.edu/catalog/11778626.