MLA

Kissinger, Henry, 1923-2023. De. Box 435, folder 11. 1980. https://collections.library.yale.edu/catalog/11777794.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 435, folder 11"])(1980)[De]. https://collections.library.yale.edu/catalog/11777794.