MLA

Van Vechten, Carl, 1880-1964. Wenner-Gren, Marguerite. Box 382, folder 5700. 1934 November 22. https://collections.library.yale.edu/catalog/10636179.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 382, folder 5700"])(1934 November 22)[Wenner-Gren, Marguerite]. https://collections.library.yale.edu/catalog/10636179.