Jones, Ken D., et al. Character People, p. 146 (1976) (full text not available online) ("Robert Middlemass appeared as a character actor in many films in the 1930s and 1940s, but he is known best as the author of The Valiant, a famous one-act play")
Roach, Bruce; Jack Morrison; Horace Robinson; G. Harry Wright; Loren Winship (1949). "One Hundred Twenty Plays Recommended for Contest and Festival Use". Educational Theatre Journal. 1 (1): 41–47. JSTOR3204108.
MaWhinney, Lucille Gale (1956). "A Program for Potential Dropouts". The Clearing House. 31 (2): 74–80. JSTOR30187297.
Merrill, John (1934). "A List of Plays of Interest to High-School Students". Francis W. Parker School Studies in Education. 10: 242–48. JSTOR41102884.
