MLA

Wilder, Thornton, 1897-1975. "First Rough Draft Screenplay": typescript carbon. Box 81, folder 2090. 1939 Sep-Oct. https://collections.library.yale.edu/catalog/17056666.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 81, folder 2090"])(1939 Sep-Oct)["First Rough Draft Screenplay": typescript carbon]. https://collections.library.yale.edu/catalog/17056666.