MLA

Van Vechten, Carl, 1880-1964. Baxter, George. Box 385, folder 5796. 1938 May 29. https://collections.library.yale.edu/catalog/2030523.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 385, folder 5796"])(1938 May 29)[Baxter, George]. https://collections.library.yale.edu/catalog/2030523.