MLA

Kissinger, Henry, 1923-2023. Ag-Ai. Box 303, folder 16. 1968-1975. https://collections.library.yale.edu/catalog/11774549.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 303, folder 16"])(1968-1975)[Ag-Ai]. https://collections.library.yale.edu/catalog/11774549.