MLA

Johnson, James Weldon, 1871-1938. Fauset, Jessie Redmon. Box 28, folder 61. 1921, 1938, undated. https://collections.library.yale.edu/catalog/16748014.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 28, folder 61"])(1921, 1938, undated)[Fauset, Jessie Redmon]. https://collections.library.yale.edu/catalog/16748014.