Christensen, Erik. “Nota-tion Examples and Graphs.” In The Music Timespace: A Theory of Music Listening.Volume 2. Alborg, Denmark: Alborg University Press, 1996.
Sites, Michael. “Spatiality Revisited in the Music of Charles Ives.” Paper presented at Ives-Copland Festival. University of Northern Colorado, Hensel-Phelps Auditorium and Theater, Greeley, Colorado, October 28-30, 1993.