MLA

Van Vechten, Carl, 1880-1964. Barnes, Albert C. (Albert Coombs), at his home, Lower Merion Township, Pennsylvania. Box 334, folder 4193. 1936 December 6. https://collections.library.yale.edu/catalog/2030365.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 334, folder 4193"])(1936 December 6)[Barnes, Albert C. (Albert Coombs), at his home, Lower Merion Township, Pennsylvania]. https://collections.library.yale.edu/catalog/2030365.