James, Robert S. (Winter 1987). "ONCE: Microcosm of the 1960s Musical and Multimedia Avant-Garde". American Music. 5 (4). University of Illinois Press: 359–390. doi:10.2307/3051447. JSTOR3051447.
Krejn, Alexander Abramovitch; von Borries, Christian; Cage, John; Culver, Andrew; Tilbury, John; De Marinis, Paul; Ashley, Robert; Christiansen, Henning; Lucier, Alvin; Cusack, Peter; Hirsch, Shelley; Hunt, Jerry; Schell, Michael; Butzmann, Frieder; Snow, Michael (1998), "Ghosts and Monsters: Contributors' Notes", Leonardo Music Journal, 8 (64): 70, doi:10.2307/1513403, JSTOR1513403
James, Robert S. (Winter 1987). "ONCE: Microcosm of the 1960s Musical and Multimedia Avant-Garde". American Music. 5 (4). University of Illinois Press: 359–390. doi:10.2307/3051447. JSTOR3051447.
Krejn, Alexander Abramovitch; von Borries, Christian; Cage, John; Culver, Andrew; Tilbury, John; De Marinis, Paul; Ashley, Robert; Christiansen, Henning; Lucier, Alvin; Cusack, Peter; Hirsch, Shelley; Hunt, Jerry; Schell, Michael; Butzmann, Frieder; Snow, Michael (1998), "Ghosts and Monsters: Contributors' Notes", Leonardo Music Journal, 8 (64): 70, doi:10.2307/1513403, JSTOR1513403
Smith, Steve. "An Opera Full of Secrets From a Master of the Opaque", The New York Times, January 14, 2007. Accessed February 25, 2019. "Seated in the kitchen of his TriBeCa rehearsal studio, which occupies an entire floor of the converted warehouse where he and his partner, Mimi Johnson, have lived since 1979, Mr. Ashley, 76, recounted how a friend had once revealed a sordid past."
