MLA

Hughes, Langston, 1902-1967. American Academy of Dramatic Arts. Box 6, folder 113. 1964 Sep. https://collections.library.yale.edu/catalog/32579245.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 6, folder 113"])(1964 Sep)[American Academy of Dramatic Arts]. https://collections.library.yale.edu/catalog/32579245.