MLA

Hughes, Langston, 1902-196, Van Vechten, Carl, 1880-1964. Stewart, Melvin, as Simple in Simply Heavenly, musical with book and lyrics by Langston Hughes and music by David Martin. Box 224. 1957 June 10. https://collections.library.yale.edu/catalog/2023600.

APA, 6th edition

Hughes, Langston, 1902-196, & Van Vechten, Carl, 1880-1964. (["Box 224"])(1957 June 10)[Stewart, Melvin, as Simple in Simply Heavenly, musical with book and lyrics by Langston Hughes and music by David Martin]. https://collections.library.yale.edu/catalog/2023600.