2001: ISBN 1-57062-871-8* "The Essential Ken Wilber: An Introductory Reader", 1998, ISBN 1-57062-379-1* "", 1998, reprint ed.
2001: ISBN 1-57062-871-8* "The Essential Ken Wilber: An Introductory Reader", 1998, ISBN 1-57062-379-1* "The Marriage of Sense and Soul: Integrating Science and Religion", 1998, reprint ed.