"Yale graduation picture, 1920"
MLA
Wilder, Thornton, 1897-1975. "Yale graduation picture, 1920". Box 149, folder 3544. 1920. https://collections.library.yale.edu/catalog/2037316.
APA, 6th edition
Wilder, Thornton, 1897-1975. (["Box 149, folder 3544"])(1920)["Yale graduation picture, 1920"]. https://collections.library.yale.edu/catalog/2037316.