I found these sources incredibly helpful

Bauer, W., and Gary D. Westfall. University physics with modern physics . New York: McGraw-Hill, 2011. Print.

Jefimenko, Oleg D.. Electricity and magnetism: an introduction to the theory of electric and magnetic fields. 2nd ed. Star City, W. Va.: Electret Scientific Co., 1989. Print.

Livingston, James D.. Rising Force The Magic of Magnetic Levitation.. Cambridge, Mass.: Harvard University Press, 2011. Print.

http://www.transrapid.de/cgi/en/basics.prg?session=ceae638a4db258f8_42808&a_no=44

http://findfuturefuels.com/read_article.php?ArticleID=68&CategoryID=5

http://en.wikipedia.org/wiki/Magnetic_levitation