MLA

Van Vechten, Carl, 1880-1964. Buchanan, Jane. Box 385 | Folder 5769. 1937 May 30. https://collections.library.yale.edu/catalog/2031362.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 385 | Folder 5769"])(1937 May 30)[Buchanan, Jane]. https://collections.library.yale.edu/catalog/2031362.