MLA

Van Vechten, Carl, 1880-1964. Hayes, Lauren. Box 92, folder 1600. 1964 August 18. https://collections.library.yale.edu/catalog/2022914.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 92, folder 1600"])(1964 August 18)[Hayes, Lauren]. https://collections.library.yale.edu/catalog/2022914.