MLA

Van Vechten, Carl, 1880-1964. Strachey, John. Box 377 | Folder 5480. 1939 January 10. https://collections.library.yale.edu/catalog/10079586.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 377 | Folder 5480"])(1939 January 10)[Strachey, John]. https://collections.library.yale.edu/catalog/10079586.