DuBois, William E. B.
MLA
Spingarn, Joel Elias, 1875-1939. DuBois, William E. B.. Box 1, folder 10-12. 1910-38. https://collections.library.yale.edu/catalog/16732372.
APA, 6th edition
Spingarn, Joel Elias, 1875-1939. (["Box 1, folder 10-12"])(1910-38)[DuBois, William E. B.]. https://collections.library.yale.edu/catalog/16732372.