Standish, David (2007) Hollow Earth. Da Capo Press, IN, USA.
Bernard, Raymond (1963) The Hollow Earth. Fieldcrest Publishing Co., NY, USA.
Griffin A., Duane (2004) Hollow & Habitable Within: Symmes’s Theory of Earth’s Internal Structure & Polar Geography. Physical Geography, Sep 2004. USA.
Kollerstrom, Nicholas (1992) The Hollow World of Edmond Halley. Journal for the History of Astronomy, Volume 23 Issue 3, August 1992. USA
Halley, Edmond (1692) An account of the cause of the change of the variation of the magnetical needle with an hypothesis of the structure of the internal parts of the Earth. Philosophical transactions, xvi (1692), 563-87. UK
Alexandria Gazette (1818) Food For Philosophers. 13 Aug 1818, p.2. VA, USA
Teed, Cyrus (1899) The Illumination of Koresh: Marvelous Experiences of the Great Alchemist Thirty Years Ago, at Utica, NY. Guiding Star, Chicago, USA.
Goodricke-Clarke, Nicholas (2004) The Occult Roots of Nazism: Secret Aryan Cults and their Influence on Nazi Ideology. Tauris Parke Paperbacks, NY, USA.