MLA

Kissinger, Henry, 1923-2023. Cohen, Jerry. Box 300, folder 4. 1968. https://collections.library.yale.edu/catalog/11774493.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 300, folder 4"])(1968)[Cohen, Jerry]. https://collections.library.yale.edu/catalog/11774493.