MLA

Hughes, Langston, 1902-1967. Dilworth, Hubert. Box 61. circa 1920-1993. https://collections.library.yale.edu/catalog/17028496.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 61"])(circa 1920-1993)[Dilworth, Hubert]. https://collections.library.yale.edu/catalog/17028496.