Bigsby, C. W. E A Critical Introduction to Twentieth-Century American Drama; Volume One, 1900-1940, Cambridge University Press, 1982.

A good overview of American theater before World War IE, this discussion devotes a full chapter to Wilder.

Blank, Martin, Editor Critical Essays on Thornton Wilder, G.K. Hall, 1996.

This is a good recent collection of articles on Wilder's work

Harrison, Gilbert A. The Enthusiast A Life of Thornton Wilder, Ticknor and Fields, 1983.

This biography, which makes use of Wilder's papers at the Yale University Bemecke Library, includes many excerpts from unpublished journals and notebooks that illuminate Wilder's troubled personal life.

Walsh, Claudette. Thornton Wilder A Reference Guide, 1926-1990, G.K. Hall, 1993.

This comprehensive annotated bibliography of works by and about Wilder is an invaluable resource for anyone studying his writings