MLA

Van Vechten, Carl, 1880-1964. Gaisseau, Pierre Dominique. Box 349, folder 4629. 1962 July 10. https://collections.library.yale.edu/catalog/33270817.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 349, folder 4629"])(1962 July 10)[Gaisseau, Pierre Dominique]. https://collections.library.yale.edu/catalog/33270817.