MLA

Van Vechten, Carl, 1880-1964. Bernstein, Aline, and Michael Frankau Cusick at the home of Aline Bernstein, Armonk, New York. Box 336, folder 4234. 1947 August 31. https://collections.library.yale.edu/catalog/2030800.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 336, folder 4234"])(1947 August 31)[Bernstein, Aline, and Michael Frankau Cusick at the home of Aline Bernstein, Armonk, New York]. https://collections.library.yale.edu/catalog/2030800.