MLA

Van Vechten, Carl, 1880-1964. Barney, Natalie Clifford. Box 334 | Folder 4196. 1935 March 30. https://collections.library.yale.edu/catalog/2030387.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 334 | Folder 4196"])(1935 March 30)[Barney, Natalie Clifford]. https://collections.library.yale.edu/catalog/2030387.