MLA

Van Vechten, Carl, 1880-1964. Essen, Abdul, as Witch Doctor in Kykunkor (The Witch Woman), opera by Asadata Dafora. Box 90, folder 1565. 1935 January 17. https://collections.library.yale.edu/catalog/2025862.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 90, folder 1565"])(1935 January 17)[Essen, Abdul, as Witch Doctor in Kykunkor (The Witch Woman), opera by Asadata Dafora]. https://collections.library.yale.edu/catalog/2025862.