MLA

Johnson, James Weldon, 1871-1938. Van Vechten, Carl. Box 21, folder 497. 1925-26. https://collections.library.yale.edu/catalog/17235682.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 21, folder 497"])(1925-26)[Van Vechten, Carl]. https://collections.library.yale.edu/catalog/17235682.