MLA

Van Vechten, Carl, 1880-1964. McFerrin, Robert. Box 97 | Folder 1749. 1955 February 28. https://collections.library.yale.edu/catalog/2026264.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 97 | Folder 1749"])(1955 February 28)[McFerrin, Robert]. https://collections.library.yale.edu/catalog/2026264.