MLA

Van Vechten, Carl, 1880-1964. Eastman, Eliena Krylenko. Box 346, folder 4542. 1934 November 27. https://collections.library.yale.edu/catalog/2034073.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 346, folder 4542"])(1934 November 27)[Eastman, Eliena Krylenko]. https://collections.library.yale.edu/catalog/2034073.