MLA

Hughes, Langston, 1902-1967. Alabama Extension Service. Box 13 (Oversize), folder 139. 1893-1954. https://collections.library.yale.edu/catalog/16206938.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 13 (Oversize), folder 139"])(1893-1954)[Alabama Extension Service]. https://collections.library.yale.edu/catalog/16206938.