MLA

Van Vechten, Carl, 1880-1964. Williams, Camilla. Box 109, folder 1997. 1946 May 31. https://collections.library.yale.edu/catalog/2028753.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 109, folder 1997"])(1946 May 31)[Williams, Camilla]. https://collections.library.yale.edu/catalog/2028753.