MLA

Hughes, Langston, 1902-1967. "Black Nativity". Box 523, folder 12975. 1962. https://collections.library.yale.edu/catalog/17034203.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 523, folder 12975"])(1962)["Black Nativity"]. https://collections.library.yale.edu/catalog/17034203.