MLA

Van Vechten, Carl, 1880-1964. Seiffert, Otto. Box 374 | Folder 5385. 1936 January 22. https://collections.library.yale.edu/catalog/10051166.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 374 | Folder 5385"])(1936 January 22)[Seiffert, Otto]. https://collections.library.yale.edu/catalog/10051166.