MLA

Kissinger, Henry, 1923-2023. Ehrlichman, John. Box 361, folder 12. 1970. https://collections.library.yale.edu/catalog/11775399.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 361, folder 12"])(1970)[Ehrlichman, John]. https://collections.library.yale.edu/catalog/11775399.