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More Great Links

• Wolfram Math World
• Free Numerology Online
• Professional Numerology
• Skeptics Society & Skeptic Magazine
• Skeptical Inquirer

Sources

• 2-numerology.com (3/2/2007)
• Astrology-numerology.com (3/2/2007)
  http://www.astrology-numerology.com/numerology.html
• Cusante, Johny. "Professional Numerology." (3/2/2007)
  http://www.professionalnumerology.com/
• Drayer, Ruth A. "Numerology: The Power of Numbers." Square One Publishers. 2003.
• Dudley, Underwood. "Numerology: Or What Pythagoras Wrought." The Mathematical Association of America. 1997.
• Encyclopedia Britannica. "Numerals and Numeral Systems." 2007. Encyclopedia Britannica Online. (3/2/2007)
• Encyclopedia Britannica. "Numerology." 2007. Encyclopedia Britannica Online. (3/1/2007)
• Encyclopedia Britannica. "Pythagoreanism." 2007. Encyclopedia Britannica Online. (3/2/2007)
• Martin, Bruce. "Coincidences: Remarkable or Random?" Skeptical Inquirer. (3/2/2007)
  http://www.csicop.org/si/9809/coincidence.html
• Numerology-free.com (3/2/2007)
  http://www.numerology-free.com/
• Randi, James. "Numerology." Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural." (3/2/2007)
  http://www.randi.org/encyclopedia/numerology.html
• Shermer, Michael. "Smart People Believe Weird Things." Scientific American. 11/2002.
  http://www.sciam.com/article.cfm?articleID=0002F4E6-8CF7- 1D49-90FB809EC5880000 (3/2/2007)
• Shine, Norman. "Numerology: Your Character and Future Revealed in Numbers." Fireside. 1994.
• Weisstein, Eric W. "Beast Number." From MathWorld--A Wolfram Web Resource.
  http://mathworld.wolfram.com/BeastNumber.html
• Weisstein, Eric W. "Birthday Problem." From MathWorld--A Wolfram Web Resource. (3/2/2007)
  http://mathworld.wolfram.com/BirthdayProblem.html