Kramer, Lawrence. “A Completely New Set of Objects.” In Music and Poetry: The Nineteenth Century and After, 171-202. Berkeley, CA: University of California Press. 1984.
Charles Wuorinen. “An Interview with Barney Childs, 1962” (368--375). In Contemporary Composers on Contemporary Music, edited by Elliott Schwartz and Barney Childs, 221-242. New York, NY: Holt, Rinehart and Winston, 1967.
Brant, Henry. “Space as an Essential Aspect of Musical Composition.” In Contemporary Composers on Contemporary Music, edited by Elliott Schwartz and Barney Childs, 221-242. New York, NY: Holt, Rinehart and Winston, 1967.
Dahlhaus, Carl. “Aussenseiter der Neuen Musik: Charles Ives und Edgard Varese.” In "Bericht über den internationalen Kongreß" Bonn 1970, edited by Carl Dahlhaus, 299. Kassel, Germany: Bärenreiter Verlag, 1971.