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Hogan, Linda. (1995). Dwellings: A Spiritual History of the Living World. New York, NY: Simon & Schuster Inc. ISBN: 978-0-684-83033-9
Pranis, Kay. (2005). The Little Book of Circle Processes. Intercourse, PA: Good Books. ISBN: 978-1-56148-461-4
Zajonc, Arthur. (2009). Meditation as Contemplative Inquiry: When Knowledge becomes Love. Great Barrington, MA: Lindesfarne Books. ISBN: 978-1-58420-062-8