Levenda est surtout connu pour son livre Unholy Alliance (L'Alliance Impie) (sur l'occultisme et le mysticisme nazi), et comme l'auteur potentiel de « Necronomicon Simon ».
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L'Alliance infernale, Une histoire de l'implication nazie dans l'occulte (Unholy Alliance: A History of Nazi Involvement With the Occult), édition Camion Noir, 1994 (ISBN978-2-910196-77-6)
Sinister Forces - The Nine: A Grimoire of American Political Witchcraft, 2005
Sinister Forces - A Warm Gun: A Grimoire of American Political Witchcraft, 2005
Allianza Malefica / Unholy Alliance: The Nazis and the Power of the Occult, 2006
Sinister Forces - The Manson Secret: A Grimoire of American Political Witchcraft, 2006
Gates of the Necronomicon, 2006
The Mao of Business: Guerrilla Trade Techniques for the New China, 2007
Stairway to Heaven: Chinese Alchemists, Jewish Kabbalists, and the Art of Spiritual Transformation, 2008.
The Secret Temple: Masons, Mysteries and the Founding of America (2009)
Tantric Temples: Eros and Magic in Java (2011)
Ratline: Soviet Spies, Nazi Priests, and the Disappearance of Adolf Hitler (2012)
The Angel And The Sorcerer (2012)
The Dark Lord: H. P. Lovecraft, Kenneth Grant, and the Typhonian Tradition in Magic (2013)
(en) The Hitler Legacy: The Nazi Cult in Diaspora, How it was Organized, How it was Funded, and Why it remains a Threat to Global Security in the Age of Terrorism, Lake Worth, FL, Ibis Press, , 320p. (ISBN978-0-89254-210-9, OCLC892304752, présentation en ligne)
The Tantric Alchemist: Thomas Vaughan and the Indian Tantric Tradition (2015)