MLA

Hughes, Langston, 1902-1967. Buck, Gene. Box 15 (Oversize), folder 154. 1893-1954. https://collections.library.yale.edu/catalog/16206950.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 15 (Oversize), folder 154"])(1893-1954)[Buck, Gene]. https://collections.library.yale.edu/catalog/16206950.