MLA

Kissinger, Henry, 1923-2023. Bradley, Bruce. Box 9, folder 19. 1968. https://collections.library.yale.edu/catalog/11782442.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 9, folder 19"])(1968)[Bradley, Bruce]. https://collections.library.yale.edu/catalog/11782442.