MLA

Johnson, James Weldon, 1871-1938. Boyle, Louise. Box 3, folder 53. 1918, 1925, undated. https://collections.library.yale.edu/catalog/31919237.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 3, folder 53"])(1918, 1925, undated)[Boyle, Louise]. https://collections.library.yale.edu/catalog/31919237.