APA (7th ed.) Citation

De Bono, E. (1990). The Happiness purpose (Repr. of the first print by Maurice Temple Smith of 1970.). Penguin books.

Chicago Style (17th ed.) Citation

De Bono, Edward. The Happiness Purpose. Repr. of the first print by Maurice Temple Smith of 1970. London: Penguin books, 1990.

MLA (9th ed.) Citation

De Bono, Edward. The Happiness Purpose. Repr. of the first print by Maurice Temple Smith of 1970. Penguin books, 1990.