MLA

Kissinger, Henry, 1923-2023. Galley proofs. Box 256, folder 5. 1968 November. https://collections.library.yale.edu/catalog/11786686.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 256, folder 5"])(1968 November)[Galley proofs]. https://collections.library.yale.edu/catalog/11786686.