MLA

Kissinger, Henry, 1923-2023. Ca. Box 18, folder 6. 2004. https://collections.library.yale.edu/catalog/12480961.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 18, folder 6"])(2004)[Ca]. https://collections.library.yale.edu/catalog/12480961.