MLA

Johnson, James Weldon, 1871-1938. James Weldon Johnson with Bob Cole and Rosamond Johnson. Box 104, folder 879. 1904. https://collections.library.yale.edu/catalog/2109037.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 104, folder 879"])(1904)[James Weldon Johnson with Bob Cole and Rosamond Johnson]. https://collections.library.yale.edu/catalog/2109037.