Below are links to books on Amazon to learn more about spiritualities that do not involve beliefs about the supernatural.
Spiritual/Religious Naturalism
- Religious Naturalism Today by Jerome Stone
- The Sacred Depths of Nature by Ursula Goodenough
- Exploring Spiritual Naturalism, Year 1 by DT Strain
- Exploring Spiritual Naturalism, Year 2 by Jeremy Mattocks
- Exploring Spiritual Naturalism, Year 3 by Julia Strain
- The Routledge Handbook of Religious Naturalism by Donald Crosby
- The Thou of Nature by Donald Crosby
- Spiritual Naturalism by Jay Forrest
Religious Humanism
- Becoming More Fully Human by William Murry
- The Humanist Way by Edward Ericson
Secular Buddhism
- Secular Buddhism by Stephen Batchelor
- After Buddhism by Stephen Batchelor
- Secular Buddhism by Noah Rasheta
- Secular Buddhism by Jay Forrest
Other Books
- Beyond Religion by Dalai Lama
- Waking Up by Sam Harris
- Secular Meditation by Rick Heller
- Spirituality for the Skeptic by Robert Solomon