MLA

Hughes, Langston, 1902-1967. Newport festivals. Box 547, folder 13316. 1958, 1960, n.d.. https://collections.library.yale.edu/catalog/17394806.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 547, folder 13316"])(1958, 1960, n.d.)[Newport festivals]. https://collections.library.yale.edu/catalog/17394806.