MLA

Kissinger, Henry, 1923-2023. L. Box 562, folder 7. 1988. https://collections.library.yale.edu/catalog/11779596.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 562, folder 7"])(1988)[L]. https://collections.library.yale.edu/catalog/11779596.