MLA

Hughes, Langston, 1902-1967. Spingarn, Joel Elias. Box 17, folder 211. 1875-1978. https://collections.library.yale.edu/catalog/2052753.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 17, folder 211"])(1875-1978)[Spingarn, Joel Elias]. https://collections.library.yale.edu/catalog/2052753.