MLA

Kissinger, Henry, 1923-2023. Vietnam-letters from friends. Box 237, folder 10. 1968. https://collections.library.yale.edu/catalog/11786319.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 237, folder 10"])(1968)[Vietnam-letters from friends]. https://collections.library.yale.edu/catalog/11786319.