Visser, F. (2003). Ken Wilber: Thought as passion. State University of New York Press.
Lua i Stíl Chicago (17ú heag.)Visser, Frank. Ken Wilber: Thought as Passion. Albany, NY: State University of New York Press, 2003.
Lua MLA (9ú heag.)Visser, Frank. Ken Wilber: Thought as Passion. State University of New York Press, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.