MLA

Kissinger, Henry, 1923-2023. He. Box 637, folder 7. 1982. https://collections.library.yale.edu/catalog/11780581.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 637, folder 7"])(1982)[He]. https://collections.library.yale.edu/catalog/11780581.