MLA

Van Vechten, Carl, 1880-1964. Thayer, Alonzo. Box 105, folder 1923. 1935 November 25. https://collections.library.yale.edu/catalog/2028115.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 105, folder 1923"])(1935 November 25)[Thayer, Alonzo]. https://collections.library.yale.edu/catalog/2028115.