MLA

Kissinger, Henry, 1923-2023. Beaufre, André. Box 8, folder 12. 1962-1968. https://collections.library.yale.edu/catalog/11782410.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 8, folder 12"])(1962-1968)[Beaufre, André]. https://collections.library.yale.edu/catalog/11782410.