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** Diesel, Andreas. Gerten, Dieter (2007). ''Looking for Europe: Neofolk und Hintergründe''. Index Verlag. ISBN:3-936878-02-1
** Grimm, Jacob (James Steven Stallybrass Trans.) (1882). ''[[Deutsche Mythologie|Teutonic Mythology: Translated from the Fourth Edition with Notes and Appendix]]'' Vol. I. London: George Bell and Sons.** Grimm, Jacob (James Steven Stallybrass Trans.) (1883). ''[[Deutsche Mythologie|Teutonic Mythology: Translated from the Fourth Edition with Notes and Appendix]]'' Vol. II. London: George Bell and Sons.
* [[Alexander Hislop|Hislop, Alexander]] (1903). ''[[The Two Babylons]]''. Third edition. S.W. Partridge. Web.
* Hubbard, Benjamin Jerome. Hatfield, John T. Santucci, James A. (2007). ''An Educator's Classroom Guide to America's Religious Beliefs and Practices''. Libraries Unlimited. {{ISBN|1-59158-409-4}}