Ferrer, J. N. (2002)
Revisioning Transpersonal Theory:
A Participatory Vision of Human Spirituality.
Albany (New York, EUA):
State University New York Press.

Ferrer, J. N. (2002)
Espiritualidat Creativa.
Una visión participativa de lo transpersonal.
Barcelona (Spain): Kairós, 2003