MLA

Hughes, Langston, 1902-1967. People's Forum of Montreal. Box 127, folder 2388. 1937-44. https://collections.library.yale.edu/catalog/17020446.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 127, folder 2388"])(1937-44)[People's Forum of Montreal]. https://collections.library.yale.edu/catalog/17020446.