MLA

Van Vechten, Carl, 1880-1964. Shaffer, Angevine Hayward, at her home, 2001 Linden Drive, Cedar Rapids, Iowa. Box 375, folder 5404. 1937 October 28. https://collections.library.yale.edu/catalog/10054007.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 375, folder 5404"])(1937 October 28)[Shaffer, Angevine Hayward, at her home, 2001 Linden Drive, Cedar Rapids, Iowa]. https://collections.library.yale.edu/catalog/10054007.