MLA

Kissinger, Henry, 1923-2023. Fr. Box 31, folder 9. 2006. https://collections.library.yale.edu/catalog/12481406.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 31, folder 9"])(2006)[Fr]. https://collections.library.yale.edu/catalog/12481406.