MLA

Van Vechten, Carl, 1880-1964. Schuyler, Josephine. Box 223. 1948 February 18. https://collections.library.yale.edu/catalog/2018389.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 223"])(1948 February 18)[Schuyler, Josephine]. https://collections.library.yale.edu/catalog/2018389.