MLA

Van Vechten, Carl, 1880-1964. Goldman, Emma. Box 350, folder 4670. 1934 March 6. https://collections.library.yale.edu/catalog/2035482.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 350, folder 4670"])(1934 March 6)[Goldman, Emma]. https://collections.library.yale.edu/catalog/2035482.