MLA

Johnson, James Weldon, 1871-1938. Course materials, holograph. Box 78, folder 574. 1932. https://collections.library.yale.edu/catalog/16867990.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 78, folder 574"])(1932)[Course materials, holograph]. https://collections.library.yale.edu/catalog/16867990.