MLA

Van Vechten, Carl, 1880-1964. Johnson, Charles Spurgeon. Box 224. 1948 January 21. https://collections.library.yale.edu/catalog/2022491.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 224"])(1948 January 21)[Johnson, Charles Spurgeon]. https://collections.library.yale.edu/catalog/2022491.