MLA

Kissinger, Henry, 1923-2023. Beard, Robin. Box 412, folder 12. 1978. https://collections.library.yale.edu/catalog/11777478.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 412, folder 12"])(1978)[Beard, Robin]. https://collections.library.yale.edu/catalog/11777478.