MLA

Kissinger, Henry, 1923-2023. Decennial Conference on Ideas and Action, Dedham, Massachusetts, May 18-21, 1961. Box 91, folder 12. Circa 1961 May. https://collections.library.yale.edu/catalog/11783996.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 91, folder 12"])(Circa 1961 May)[Decennial Conference on Ideas and Action, Dedham, Massachusetts, May 18-21, 1961]. https://collections.library.yale.edu/catalog/11783996.