MLA

Van Vechten, Carl, 1880-1964. Angus, Donald. Box 332 | Folder 4141. 1934 July 18. https://collections.library.yale.edu/catalog/2030075.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 332 | Folder 4141"])(1934 July 18)[Angus, Donald]. https://collections.library.yale.edu/catalog/2030075.