MLA

Kissinger, Henry, 1923-2023. du Chastain, Gabriel. Box 17, folder 14. 1964-1967. https://collections.library.yale.edu/catalog/11782614.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 17, folder 14"])(1964-1967)[du Chastain, Gabriel]. https://collections.library.yale.edu/catalog/11782614.