APA (7th ed.) Citation

De Bono, E. (1967). The five-day course in thinking. Penguin.

Chicago Style (17th ed.) Citation

De Bono, Edward. The Five-day Course in Thinking. Harmondsworth, Middlesex, England: Penguin, 1967.

MLA (9th ed.) Citation

De Bono, Edward. The Five-day Course in Thinking. Penguin, 1967.