Ariely, Dan. Predictably irrational : the hidden forces that shape our decisions / Dan Ariely. - 1st ed. - New York, NY : Harper, c2008. ISBN: 9780061353239 (hbk.) 006135323X LCCN: 2008273863 LC Class. No.: BF448 / .A75 2008 Dewey Class. No.: 153.8/3