MLA

Kissinger, Henry, 1923-2023. Clapp, Mary. Box 13, folder 4. 1967 September-1968. https://collections.library.yale.edu/catalog/11782512.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 13, folder 4"])(1967 September-1968)[Clapp, Mary]. https://collections.library.yale.edu/catalog/11782512.