MLA

Kissinger, Henry, 1923-2023. Bundy, McGeorge. Box 10, folder 19. 1960-1966, undated. https://collections.library.yale.edu/catalog/11782466.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 10, folder 19"])(1960-1966, undated)[Bundy, McGeorge]. https://collections.library.yale.edu/catalog/11782466.