MLA

Kissinger, Henry, 1923-2023. Stanton, J. William. Box 420, folder 1. 1978. https://collections.library.yale.edu/catalog/11777578.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 420, folder 1"])(1978)[Stanton, J. William]. https://collections.library.yale.edu/catalog/11777578.