Pollan, Stephen M. It's all in your head : thinking your way to happiness : the 8 essential secrets to leading a life without regret / by Stephen M. Pollan and Mark Levine. - New York : Collins, c2005. - 216 p. ; 23 cm. ISBN: 0060759992 (cloth) Subjects--Topical Terms: Happiness. Dewey Class. No.: 158.1 / POL