MLA

Kissinger, Henry, 1923-2023. Sm. Box 321, folder 15. 1969-1975. https://collections.library.yale.edu/catalog/11774811.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 321, folder 15"])(1969-1975)[Sm]. https://collections.library.yale.edu/catalog/11774811.