MLA

Kissinger, Henry, 1923-2023. Bailey, Anne Marie. Box 7, folder 6. 1968. https://collections.library.yale.edu/catalog/11782384.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 7, folder 6"])(1968)[Bailey, Anne Marie]. https://collections.library.yale.edu/catalog/11782384.