MLA

Hughes, Langston, 1902-1967. Baker, Josephine. Box 12, folder 256. 1958-67, n.d.. https://collections.library.yale.edu/catalog/33412759.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 12, folder 256"])(1958-67, n.d.)[Baker, Josephine]. https://collections.library.yale.edu/catalog/33412759.