MLA

Van Vechten, Carl, 1880-1964. Sprinchorn, Carl. Box 376 | Folder 5458. 1935 December 30. https://collections.library.yale.edu/catalog/10058529.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 376 | Folder 5458"])(1935 December 30)[Sprinchorn, Carl]. https://collections.library.yale.edu/catalog/10058529.