APA (7th ed.) Citation

POLLEN & Levine. (2005). It's all in your head: Thinking your way to happiness. Harper Collins.

Chicago Style (17th ed.) Citation

POLLEN and Levine. It's All in Your Head: Thinking Your Way to Happiness. New York: Harper Collins, 2005.

MLA (9th ed.) Citation

POLLEN and Levine. It's All in Your Head: Thinking Your Way to Happiness. Harper Collins, 2005.