MLA

Johnson, James Weldon, 1871-1938. "Atlanta University Quartette". Box 104, folder 877. circa 1893. https://collections.library.yale.edu/catalog/2110143.

APA, 6th edition

Johnson, James Weldon, 1871-1938. (["Box 104, folder 877"])(circa 1893)["Atlanta University Quartette"]. https://collections.library.yale.edu/catalog/2110143.