MLA

Johnson, James Weldon, 1871-1938. Schieffelin, William Jay. Box 17, folder 425. 1933-37. https://collections.library.yale.edu/catalog/16748007.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 17, folder 425"])(1933-37)[Schieffelin, William Jay]. https://collections.library.yale.edu/catalog/16748007.