MLA

Kissinger, Henry, 1923-2023. Second draft. Box 255, folder 8. 1968 September 4. https://collections.library.yale.edu/catalog/11786678.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 255, folder 8"])(1968 September 4)[Second draft]. https://collections.library.yale.edu/catalog/11786678.