MLA

Kissinger, Henry, 1923-2023. L. Box 593, folder 10. 1994. https://collections.library.yale.edu/catalog/11779997.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 593, folder 10"])(1994)[L]. https://collections.library.yale.edu/catalog/11779997.