MLA

Van Vechten, Carl, 1880-1964. Quintero, José. Box 371, folder 5298. 1958 July 25. https://collections.library.yale.edu/catalog/10001366.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 371, folder 5298"])(1958 July 25)[Quintero, José]. https://collections.library.yale.edu/catalog/10001366.