MLA

Kissinger, Henry, 1923-2023. Zierer, Elizabeth. Box 633, folder 6. 1946. https://collections.library.yale.edu/catalog/11780518.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 633, folder 6"])(1946)[Zierer, Elizabeth]. https://collections.library.yale.edu/catalog/11780518.