1. Gilbert, W.De Magnete; Dover Publications, Inc. New York, 1958 (translated by P. Fluery Mottelay).
2. (a) Verschuur, G. L.Hidden Attraction: The History and Mystery ofMagnetism; Oxford University Press: Oxford, UK, 1993.
3. Livingston, J. D.Driving Force: The Natural Magic of Magnets; Harvard University Press: Cambridge, MA, 1996.
4. The lodestone: A survey of the history and the physics
5. Morrish, A. H.The Physical Principles of Magnetism; John Wiley & Sons: New York, 1980; p 1.