Berger, Arthur. “His Aim Was to Be Solely American.” Review of Charles Ives and His Music, by Henry and Sidney Cowell. The New York Times Book Review, January 9, 1955, section 7, 3.
Schonberg, Harold C. Review of Charles Ives and His Music, by Henry and Sidney Cowell. Musical Courier 151, no. 4 (15 February 1955): 45; reprinted in Tempo 36 (Summer 1955): 31-32.