MLA

Kissinger, Henry, 1923-2023. U. Box 525, folder 4. 1994. https://collections.library.yale.edu/catalog/11779000.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 525, folder 4"])(1994)[U]. https://collections.library.yale.edu/catalog/11779000.