The Mystery of Numbers, by Annemarie Schimmel (1996) ISBN 0-19-506303-1—A scholarly compendium of the connotations and associations of numbers in historical cultures.
Numerology : The number game, by Aaadietya Pandey (2006).
Numerology: Or, What Pythagoras Wrought by Underwood Dudley; 1997; Mathematical Association of America.—Highly skeptical survey of the field through history.
Andras M. Nagy (2007): "The Secret of Pythagoras".(DVD) ASIN: B000VPTFT6