MLA

Kissinger, Henry, 1923-2023. Y. Box 5, folder 13. 2001. https://collections.library.yale.edu/catalog/12479258.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 5, folder 13"])(2001)[Y]. https://collections.library.yale.edu/catalog/12479258.