APA Style

Rubin, Gretchen. (2009). The Happiness Project . New York: HarperCollinsPublishers.

Chicago Style

Rubin, Gretchen. The Happiness Project. New York: HarperCollinsPublishers, 2009. Text.

MLA Style

Rubin, Gretchen. The Happiness Project. New York: HarperCollinsPublishers, 2009. Text.

Turabian Style

Rubin, Gretchen. The Happiness Project. New York: HarperCollinsPublishers, 2009. Print.