MLA

Kissinger, Henry, 1923-2023. Philosophy AB. Box 69, folder 10. Circa 1947-circa 1950. https://collections.library.yale.edu/catalog/11783733.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 69, folder 10"])(Circa 1947-circa 1950)[Philosophy AB]. https://collections.library.yale.edu/catalog/11783733.