MLA

Johnson, James Weldon, 1871-1938. Broun, Heywood. Box 4, folder 62. 1924-34, undated. https://collections.library.yale.edu/catalog/16747977.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 4, folder 62"])(1924-34, undated)[Broun, Heywood]. https://collections.library.yale.edu/catalog/16747977.