MLA

Hughes, Langston, 1902-1967. "Goodbye Newport Blues". Box 564, folder 13521. 1961. https://collections.library.yale.edu/catalog/17394808.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 564, folder 13521"])(1961)["Goodbye Newport Blues"]. https://collections.library.yale.edu/catalog/17394808.