MLA

Kissinger, Henry, 1923-2023. Sulzberger, Arthur Ochs. Box 603, folder 6. 1996. https://collections.library.yale.edu/catalog/11780123.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 603, folder 6"])(1996)[Sulzberger, Arthur Ochs]. https://collections.library.yale.edu/catalog/11780123.