MLA

Kissinger, Henry, 1923-2023. Dr. Box 309, folder 8. 1969-1973. https://collections.library.yale.edu/catalog/11774626.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 309, folder 8"])(1969-1973)[Dr]. https://collections.library.yale.edu/catalog/11774626.