MLA

Kissinger, Henry, 1923-2023. Ce. Box 30, folder 9. 2006. https://collections.library.yale.edu/catalog/12481414.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 30, folder 9"])(2006)[Ce]. https://collections.library.yale.edu/catalog/12481414.