Morris, R. (1997). Letters to John Cage. October.
Lua i Stíl Chicago (17ú heag.)Morris, Robert. "Letters to John Cage." October 1997.
Lua MLA (8ú heag.)Morris, Robert. "Letters to John Cage." October, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.