MLA

Richards, Lloyd, 1919-2006. August Wilson. Box 88, folder 1025-1029. 1966-2002. https://collections.library.yale.edu/catalog/10871590.

APA, 6th edition

Richards, Lloyd, 1919-2006. (["Box 88, folder 1025-1029"])(1966-2002)[August Wilson]. https://collections.library.yale.edu/catalog/10871590.