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Wachholtz, Amy B.; Pargament, Kenneth I. (2005). "Is Spirituality a Critical Ingredient of Meditation? Comparing the Effects of Spiritual Meditation, Secular Meditation, and Relaxation on Spiritual, Psychological, Cardiac, and Pain Outcomes". Journal of Behavioral Medicine. 28 (2): 369–84. doi:10.1007/s10865-005-9008-5. PMID16049627. S2CID2987374.
Elkins, D. N.; Hedstrom, L. J.; Hughes, L. L.; Leaf, J. A. & Saunders, C. (1988). "Toward a humanistic-phenomenological spirituality". Journal of Humanistic Psychology. 28 (4): 10. doi:10.1177/0022167888284002. S2CID145708067.
Wachholtz, Amy B.; Pargament, Kenneth I. (2005). "Is Spirituality a Critical Ingredient of Meditation? Comparing the Effects of Spiritual Meditation, Secular Meditation, and Relaxation on Spiritual, Psychological, Cardiac, and Pain Outcomes". Journal of Behavioral Medicine. 28 (2): 369–84. doi:10.1007/s10865-005-9008-5. PMID16049627. S2CID2987374.
Kathleen, Fischer (2011). "Long Life on a Fragile Planet: Nature, Spirituality, and Aging". Journal of Religion, Spirituality & Aging. 23 (3): 172–183. doi:10.1080/15528030.2010.533408. S2CID145650882.
Crawford, Marisa; Rossiter, Graham (1996-06-01). "The Secular Spirituality of Youth: Implications for Religious Education". British Journal of Religious Education. 18 (3): 133–143. doi:10.1080/0141620960180302. ISSN0141-6200.