Visser, F. (2003). Ken Wilber: Thought as passion. State University of New York Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVisser, Frank. Ken Wilber: Thought as Passion. Albany, NY: State University of New York Press, 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVisser, Frank. Ken Wilber: Thought as Passion. State University of New York Press, 2003.
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