Putnam, Frank W. “Altering Consciousness: Multidisciplinary Perspectives Volumes 1 & 2 Edited by Etzel Cardeña and Michael Winkelman”. Journal of Scientific Exploration 26, no. 4 (December 5, 2012). Accessed October 1, 2022. https://journalofscientificexploration.org/index.php/jse/article/view/571.