MLA

Van Vechten, Carl, 1880-1964. Bouché, Louis. Box 337 | Folder 4267. 1937 May 1. https://collections.library.yale.edu/catalog/2031091.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 337 | Folder 4267"])(1937 May 1)[Bouché, Louis]. https://collections.library.yale.edu/catalog/2031091.