MLA

Kissinger, Henry, 1923-2023. Ab. Box 503, folder 8. 1989. https://collections.library.yale.edu/catalog/11778643.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 503, folder 8"])(1989)[Ab]. https://collections.library.yale.edu/catalog/11778643.