MLA

Van Vechten, Carl, 1880-1964. Leger, Fernand. Box 361, folder 4980. 1936 February 17. https://collections.library.yale.edu/catalog/2056396.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 361, folder 4980"])(1936 February 17)[Leger, Fernand]. https://collections.library.yale.edu/catalog/2056396.