MLA

Kissinger, Henry, 1923-2023. Mo. Box 573, folder 4. 1989. https://collections.library.yale.edu/catalog/11779718.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 573, folder 4"])(1989)[Mo]. https://collections.library.yale.edu/catalog/11779718.