1992: The Occult Roots of Nazism: Secret Aryan Cults and Their Influence on Nazi Ideology, New York: New York University Press ISBN 978-0-8147-3060-7 2004: The Occult Roots of Nazism: Secret Aryan Cults and Their Influence on Nazi Ideology, (Expanded with a new Preface) I.B. Tauris & Co. ISBN 1-86064-973-4. Spanish edition 2005: Las Oscuras Raíces del Nazismo.