MLA

Kissinger, Henry, 1923-2023. J. Box 606, folder 6. 1997. https://collections.library.yale.edu/catalog/11780163.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 606, folder 6"])(1997)[J]. https://collections.library.yale.edu/catalog/11780163.