MLA

Richards, Lloyd, 1919-2006. August Wilson. Box 146, folder 1764-1765. 1987. https://collections.library.yale.edu/catalog/10871586.

APA, 6th edition

Richards, Lloyd, 1919-2006. (["Box 146, folder 1764-1765"])(1987)[August Wilson]. https://collections.library.yale.edu/catalog/10871586.