MLA

Vance, Cyrus R. (Cyrus Roberts), 1917-2002. General Counsel: swearing-in ceremony [with John F. Kennedy and Lyndon B. Johnson in attendance]. Box 57, folder 6. 1961. https://collections.library.yale.edu/catalog/10012718.

APA, 6th edition

Vance, Cyrus R. (Cyrus Roberts), 1917-2002. (["Box 57, folder 6"])(1961)[General Counsel: swearing-in ceremony [with John F. Kennedy and Lyndon B. Johnson in attendance]]. https://collections.library.yale.edu/catalog/10012718.