Nahm, Michael. “A History of the (Attempted) Institutionalization of Parapsychology: Okkultismus Im Gehäuse. Institutionalisierungen Der Parapsychologie Im 20. Jahrhundert Im Internationalen Vergleich. [Occultism in the Housings. Institutionalizations of Parapsychology I”. Journal of Scientific Exploration 34, no. 4 (December 24, 2020): 849-853. Accessed February 26, 2021. https://journalofscientificexploration.org/index.php/jse/article/view/1953.