MLA

Van Vechten, Carl, 1880-1964. Barnes, Djuna. Box 334, folder 4195. 1933 November 29. https://collections.library.yale.edu/catalog/2030379.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 334, folder 4195"])(1933 November 29)[Barnes, Djuna]. https://collections.library.yale.edu/catalog/2030379.