MLA

Van Vechten, Carl, 1880-1964. Thomson, Virgil. Box 378 | Folder 5513. 1937 November 30. https://collections.library.yale.edu/catalog/10081298.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 378 | Folder 5513"])(1937 November 30)[Thomson, Virgil]. https://collections.library.yale.edu/catalog/10081298.