MLA

Kissinger, Henry, 1923-2023. Dartmouth College. Box 15, folder 20. 1957-1958. https://collections.library.yale.edu/catalog/11782571.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 15, folder 20"])(1957-1958)[Dartmouth College]. https://collections.library.yale.edu/catalog/11782571.