MLA

Kissinger, Henry, 1923-2023. Catlin, George. Box 12, folder 10. 1968. https://collections.library.yale.edu/catalog/11782493.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 12, folder 10"])(1968)[Catlin, George]. https://collections.library.yale.edu/catalog/11782493.