MLA

Van Vechten, Carl, 1880-1964. Ayler, Ethel, as Zirata in Simply Heavenly, musical with book and lyrics by Langston Hughes and music by David Martin. Box 83 | Folder 1373. 1957 June 10. https://collections.library.yale.edu/catalog/2020550.

APA, 6th edition

Van Vechten, Carl, 1880-1964. (["Box 83 | Folder 1373"])(1957 June 10)[Ayler, Ethel, as Zirata in Simply Heavenly, musical with book and lyrics by Langston Hughes and music by David Martin]. https://collections.library.yale.edu/catalog/2020550.