MLA

Kissinger, Henry, 1923-2023. Th. Box 509, folder 7. 1989. https://collections.library.yale.edu/catalog/11778727.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 509, folder 7"])(1989)[Th]. https://collections.library.yale.edu/catalog/11778727.