MLA

Kissinger, Henry, 1923-2023. D. Box 557, folder 6. 1987. https://collections.library.yale.edu/catalog/11779521.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 557, folder 6"])(1987)[D]. https://collections.library.yale.edu/catalog/11779521.