MLA

Hughes, Langston, 1902-1967. Grant, George Franklin. Box 4 (Oversize), folder 56. 1908, 1910, undated. https://collections.library.yale.edu/catalog/16196989.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 4 (Oversize), folder 56"])(1908, 1910, undated)[Grant, George Franklin]. https://collections.library.yale.edu/catalog/16196989.