MLA

Van Vechten, Carl, 1880-1964. Myers, Carmel. Box 369, folder 5209. 1933 October 8. https://collections.library.yale.edu/catalog/2067025.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 369, folder 5209"])(1933 October 8)[Myers, Carmel]. https://collections.library.yale.edu/catalog/2067025.