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Habel, Norman, O'Donoghue, Michael and Maddox, Marion (1993). 'Religious experience'. In: Myth, ritual and the sacred. Introducing the phenomena of religion (Underdale: University of South Australia).

Katie, Byron. Loving What Is page xi

Lewis, Ioan M (1986). Religion in context: cults and charisma (Cambridge: Cambridge University Press).

Moody, Raymond. Life After Life

Moore, B and Habel N (1982). Appendix 1. In: When religion goes to school (Adelaide: SACAE), pages 184-218.

Otto, Rudolf (1972). Chapters 2-5. In: The idea of the holy (London: Oxford University Press), pages 5–30. [Originally published in 1923].

Previous, Peter (1998). Omgaan met het transcendente (Dealing with the transcendent). Open University of the Netherlands.

Roberts, T. B. (editor) (2001). Psychoactive Sacramentals: Essays on Entheogens and Religion. San Francosco: Council on Spiritual Practices.

Roberts, T. B. "Chemical Input – Religious Output: Entheogens." Chapter 10 in Where God and Science Meet: Vol. 3: The Psychology of Religious Experience Robert McNamara (editor)(2006). Westport, CT: Praeger/Greenwood.