MLA

Van Vechten, Carl, 1880-1964. D'Alvarez, Marguerite. Box 343 | Folder 4442. 1933 March 23. https://collections.library.yale.edu/catalog/2029527.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 343 | Folder 4442"])(1933 March 23)[D'Alvarez, Marguerite]. https://collections.library.yale.edu/catalog/2029527.