APA (7th ed.) Citation

De Bono, E. (1990). The happiness purpose. Penguin Group.

Chicago Style (17th ed.) Citation

De Bono, Edward. The Happiness Purpose. London: Penguin Group, 1990.

MLA (9th ed.) Citation

De Bono, Edward. The Happiness Purpose. Penguin Group, 1990.

Warning: These citations may not always be 100% accurate.