MLA

Kissinger, Henry, 1923-2023. Bowie, Robert. Box 121, folder 1. Circa 1957-circa 1959. https://collections.library.yale.edu/catalog/11784459.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 121, folder 1"])(Circa 1957-circa 1959)[Bowie, Robert]. https://collections.library.yale.edu/catalog/11784459.