APA (7th ed.) Citation

Summers, H., & Watson, A. (2006). The book of happiness: Brilliant ideas to transform your life. Capstone.

Chicago Style (17th ed.) Citation

Summers, Heather, and Anne Watson. The Book of Happiness: Brilliant Ideas to Transform Your Life. West Sussex: Capstone, 2006.

MLA (9th ed.) Citation

Summers, Heather, and Anne Watson. The Book of Happiness: Brilliant Ideas to Transform Your Life. Capstone, 2006.