Ponomareff, C. V., & Bryson, K. (2006). The curve of the sacred: An exploration of human spirituality. Rodopi.

Ponomareff, Constantin V., and Ken Bryson. The Curve of the Sacred: An Exploration of Human Spirituality. Amsterdam ; New York, NY: Rodopi, 2006.

Ponomareff, Constantin V., and Ken Bryson. The Curve of the Sacred: An Exploration of Human Spirituality. Rodopi, 2006.