), "The Occult World", London: Routledge, 2014 [https://www.academia.edu/10048161/The_Occult_Middle_Ages]==External links==* Center for History of Hermetic Philosophy and Related Currents, University of Amsterdam* University of Exeter Centre for the Study of Esotericism (EXESESO)* ESSWE European Society for the Study of Western Esotericism, with many links to associated organizations, libraries, scholars etc.
Freeman/Owl Book, 2002 ISBN 0-8050-7089-3, ISBN 978-0-8050-7089-7* University of Amsterdam Center for Study of Western Esotericism — Research & BA/MA programs in Western esotericism* ESSWE European Society for the Study of Western Esotericism, with many links to associated organizations, libraries, scholars etc.