MLA

Kissinger, Henry, 1923-2023. Geneva. Box 228, folder 26. 1973 December 20-21. https://collections.library.yale.edu/catalog/12481506.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 228, folder 26"])(1973 December 20-21)[Geneva]. https://collections.library.yale.edu/catalog/12481506.