MLA

Kissinger, Henry, 1923-2023. Y. Box 339, folder 4. 1973-1976. https://collections.library.yale.edu/catalog/11775060.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 339, folder 4"])(1973-1976)[Y]. https://collections.library.yale.edu/catalog/11775060.