Iverson, Jennifer. “Ives Reworks Thoreau: Charles Ives’ Interpretation of Thoreau in 114 Songs and Essays before a Sonata.” Publications of the Missouri Philological Association, vol. 27 (2002): 66.
Hellmons, Matthias. “Thema: Geister über den Wassern: Singen im Musikunterricht als Fenster zur Transzendenz.” Musik and Bildung: Praxis Musikerziehung, Vol. 34, No. 3 (2002): 28-35.
Cole, Michael S. “Concord Revisited: Charles Ives and the American Transcendentalists [Abstract].” Canadian Journal for Traditional Music, Vol. 25 (1997): 29.
Emerson, Ralph Waldo. “Quotation and Originality.” Complete Works of Ralph Waldo Emerson. Boston/New York: Houghton Mifflin, 1903. Vol-ume 8: 201: Letters and Social Aims.