MLA

Kissinger, Henry, 1923-2023. X. Box 24, folder 2. 2004. https://collections.library.yale.edu/catalog/12481334.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 24, folder 2"])(2004)[X]. https://collections.library.yale.edu/catalog/12481334.