MLA

Van Vechten, Carl, 1880-1964. McPhee, Colin. Box 367, folder 5153. 1935 April 4. https://collections.library.yale.edu/catalog/2006705.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 367, folder 5153"])(1935 April 4)[McPhee, Colin]. https://collections.library.yale.edu/catalog/2006705.