MLA

Johnson, James Weldon, 1871-1938. Larsen, Nella. Box 12, folder 282. 1933-35, undated. https://collections.library.yale.edu/catalog/16747996.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 12, folder 282"])(1933-35, undated)[Larsen, Nella]. https://collections.library.yale.edu/catalog/16747996.