MLA

Van Vechten, Carl, 1880-1964. Bailey, Pearl. Box 83 | Folder 1377. 1950 March 12. https://collections.library.yale.edu/catalog/2020570.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 83 | Folder 1377"])(1950 March 12)[Bailey, Pearl]. https://collections.library.yale.edu/catalog/2020570.