MLA

Kissinger, Henry, 1923-2023. Sy. Box 431, folder 8. 1979. https://collections.library.yale.edu/catalog/11777733.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 431, folder 8"])(1979)[Sy]. https://collections.library.yale.edu/catalog/11777733.