MLA

Hughes, Langston, 1902-1967. Thayer, Alonzo. Box 11 (Oversize), folder 127. 1931. https://collections.library.yale.edu/catalog/16206927.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 11 (Oversize), folder 127"])(1931)[Thayer, Alonzo]. https://collections.library.yale.edu/catalog/16206927.