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- Morrison, David. "Doomsday 2012, the Planet Nibiru, and Cosmophobia." Astronomical Society of the Pacific. Sept. 21, 2009. (June 3, 2011) http://www.astrosociety.org/2012/ab2009-32.pdf
- NASA.com. "2012: Beginning of the End or Why the World Won't End"? Nov. 6, 2009. (June 3, 2011) http://www.nasa.gov/topics/earth/features/2012.html