MLA

Kissinger, Henry, 1923-2023. L. Box 511, folder 15. 1989-1990. https://collections.library.yale.edu/catalog/11778765.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 511, folder 15"])(1989-1990)[L]. https://collections.library.yale.edu/catalog/11778765.