MLA

Williams, William Carlos, 1883-1963. "Betty Putnam", draft, typescript, mimeograph. Box 57, folder 1271. 1908. https://collections.library.yale.edu/catalog/17049603.

APA, 6th edition

Williams, William Carlos, 1883-1963. (["Box 57, folder 1271"])(1908)["Betty Putnam", draft, typescript, mimeograph]. https://collections.library.yale.edu/catalog/17049603.