MLA

Van Vechten, Carl, 1880-1964. Barrault, Jean-Louis. Box 334, folder 4198. 1952 December 24. https://collections.library.yale.edu/catalog/2030487.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 334, folder 4198"])(1952 December 24)[Barrault, Jean-Louis]. https://collections.library.yale.edu/catalog/2030487.