MLA

Hughes, Langston, 1902-1967. Unidentified. Box 12 (Oversize), folder 138. 1893-1954. https://collections.library.yale.edu/catalog/16206937.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 12 (Oversize), folder 138"])(1893-1954)[Unidentified]. https://collections.library.yale.edu/catalog/16206937.