MLA

Kissinger, Henry, 1923-2023. He. Box 586, folder 9. 1991-1993. https://collections.library.yale.edu/catalog/11779895.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 586, folder 9"])(1991-1993)[He]. https://collections.library.yale.edu/catalog/11779895.