MLA

Hughes, Langston, 1902-1967. Working notes. Box 316a, folder 5168. 1950-51. https://collections.library.yale.edu/catalog/31918383.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 316a, folder 5168"])(1950-51)[Working notes]. https://collections.library.yale.edu/catalog/31918383.