MLA

Kissinger, Henry, 1923-2023. Cy-Cz. Box 626, folder 6. 2001. https://collections.library.yale.edu/catalog/11780409.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 626, folder 6"])(2001)[Cy-Cz]. https://collections.library.yale.edu/catalog/11780409.