Powers, Robin (April 2005). "Counseling and Spirituality: A Historical Review". Counseling and Values. 49 (3): 217–225. doi:10.1002/j.2161-007X.2005.tb01024.x.
Taylor, Eugene (Spring 1999). "An Intellectual Renaissance of Humanistic Psychology". Journal of Humanistic Psychology. 39 (2): 7–25. doi:10.1177/0022167899392002.
Hartelius, G., Friedman, H. L., & Pappas, J. (2013). The calling to a spiritual psychology: Should transpersonal psychology convert? The Wiley-Blackwell handbook of transpersonal psychology. Malden, MA: John Wiley & Sons. doi:10.1002/9781118591277.ch3
integralinstitute.org
"History". Integral Institute. Retrieved 16 June 2022.