Ewen, David. “The Eccentrics.” In David Ewen Introduces Modern Music: A History and Appreciation: From Wagner to the Avant--Garde, 51-60. New York, NY: Chilton Publishing, 1969.
Hurley, Frank H. “Freedom: Enterprise and Charles Ives.” Lecture, Music and the American Heritage, Cleveland Institute of Music, Cleveland, Ohio, November 14, 1969.