Zimmermann, Walter. “‘Self-Reliance’ —Eigenstandigke in Charles Ives’ Charakter und Werk.” In Neuland: Ansatze zur Musik der Gegenwart, 54-58. Vol. 1. Cologne, Germany: Neuland Musikverlag Herbert Henck, 1980.
Mellers, Wilfrid H. “Realism and Transcendentalism: Charles Ives American Hero.” In Music in a New Found Land: Themes and Develop merits in the History of American Music. London, United Kingdom: Barrie and Rockliff, 1964.
1960 - Alfred Frankenstein. “Charles Ives: A Musical Transcendentalist.” In The Unforgettable Americans, edited by John A. Garraty, 323-326. Great Neck, NY: Channel Press, 1960.
Rudhyar, Dane. “The Birth of the Transcendental Movement and Its Manifestations in Music and the Modern Dance.” New Mexico Daily Examiner (August 21, 1938).
“Thoreau: Nature’s Musician.” In Henry David Thoreau: A Profile, edited by Walter Harding. American Profiles Series. New York: Hill and Wang, 1971: 105-120.
Chmaj, Betty E. “The Journey and the Mirror: Emerson and the American Arts.” In Prospects 10: An Annual of American Culture Studies, edited by Jack Salzman, 353-408. Cambridge, United Kingdom: Cambridge University Press, 1985.
Ward, Keith. “Charles Ives and the Oversoul.” Paper presented at the Mid-Atlantic Chapter Meeting of the American Musicological Society, February 3, 1985.