MLA

Kissinger, Henry, 1923-2023. Brown, Barbara. Box 149, folder 12. 1963 March-December. https://collections.library.yale.edu/catalog/11784975.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 149, folder 12"])(1963 March-December)[Brown, Barbara]. https://collections.library.yale.edu/catalog/11784975.