MLA

Kissinger, Henry, 1923-2023. Swarthmore College. Box 57, folder 19. 1964-1966. https://collections.library.yale.edu/catalog/11783496.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 57, folder 19"])(1964-1966)[Swarthmore College]. https://collections.library.yale.edu/catalog/11783496.