MLA

Kissinger, Henry, 1923-2023. Galley proofs. Box 260, folder 7. Circa 1960. https://collections.library.yale.edu/catalog/11786734.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 260, folder 7"])(Circa 1960)[Galley proofs]. https://collections.library.yale.edu/catalog/11786734.