MLA

Johnson, James Weldon, 1871-1938. Savage, Augusta. Box 17, folder 423. 1939. https://collections.library.yale.edu/catalog/16748006.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 17, folder 423"])(1939)[Savage, Augusta]. https://collections.library.yale.edu/catalog/16748006.