1Vernon Shuffet, "The Music, 1971-1975, of George Crumb: A Style Analysis" , D.M.A. diss., Peabody Institute of the Johns Hopkins University, 1979, p. 400.
2R. Schuffet, The Music, 1971-1975, of George Crumb." A Style Analysis, D.M.A. diss., Peabody institute, John Hopkins University, 1979, p. 450.
3Don Gillespie ed., George Crumb: Profile of a Composer, New York: C. F. Peter Corporation, 1986, p. 37.
4Rupert C. Allen, The Symbolic World of Federico Garci i a Lorca, Albuquerque: University of New Mexico Press, 1972, p. 115, 161-165.
5Suzanne MacLean, "George Crumb, American Composer and Visionary" , George Crumb: Profile of a Composer, Don Gillespie ed., New York: C. F. Peters Corporation, 1986, p. 20.
7Don Gillespie, "George Crumb: A Personal Recollection" , George Crumb & the Alchemy of sound: Essays on his Music, Steven Bruns & Ofer Ben-Arnots ed., Colorado College Music Press, 2005, p. 269.
8James Freeman conductor, Orchestra 2001, Night of the four moons, New York: DRAM 2007; Bruno Walter conductor, Vienna Philharmonic Orchestra, Das Lied vonder Erde, Tokyo: Opus Kura, 2004.
9Thomas Lawrence Riis, "A Conversation with George Crumb" , American Music Research Center Journal, vol. III,1993, p. 46t.
10Simon Trezise, Debussy: LaMer, Cambridge: Cambridge University Press, 1994, p. 2.
