Mellers, Wilfrid H. “Jottings of Charles Ives” [Appendix I]. In Music in a New Found Land: Themes and Developments in the History of American Music, 441-443. London, United Kingdom: Barrie and Rockliff, 1964.
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.
Abell, Arthur M. Gesprache mit beruhmten Komponisten, so entstand- en ihre unsterblichen Meisterwerke. Eschwege, West Germany: G.E. Schroeder Verlag, 1964.
“Additional Ives Letters, Mostly 1907--1908,” compiled and edited by John Kirkpatrick (July 1964). Charles Ives Papers. Irving S. Gilmore Library, Yale University, New Haven, CT. Microfilm copy.
Helms, Hans G. “Der Komponist Charles Ives: Leben, Werk, und Ein- fluss auf die heutige Generation.” Neue Zeitschrift für Musik (October 1964) 125/10: 425-433.