MLA

Hughes, Langston, 1902-1967. Abyssinian Baptist Church. Box 2, folder 21. 1962. https://collections.library.yale.edu/catalog/32604225.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 2, folder 21"])(1962)[Abyssinian Baptist Church]. https://collections.library.yale.edu/catalog/32604225.