MLA

Hughes, Langston, 1902-1967. African Letters: A-N. Box 222, folder 3693-3699. 1934-67, n.d.. https://collections.library.yale.edu/catalog/31916027.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 222, folder 3693-3699"])(1934-67, n.d.)[African Letters: A-N]. https://collections.library.yale.edu/catalog/31916027.