Visser, C. 2019. Van Elk, Michiel, Extase (2017), Over de godhelm en andere religieuze experimenten: Amsterdam: Boom, pp. 207, ISBN 9789024408566, € 20,-. Religie & Samenleving. 14, 1 (jan. 2019), 89–92. DOI:https://doi.org/10.54195/RS.11591.