MLA

Kissinger, Henry, 1923-2023. N. Box 514, folder 15. 1990-1991. https://collections.library.yale.edu/catalog/11778820.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 514, folder 15"])(1990-1991)[N]. https://collections.library.yale.edu/catalog/11778820.