MLA

Kissinger, Henry, 1923-2023. Vance, Cyrus. Box 303, folder 8. 1968. https://collections.library.yale.edu/catalog/11774540.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 303, folder 8"])(1968)[Vance, Cyrus]. https://collections.library.yale.edu/catalog/11774540.