APA (7th ed.) Citation

De Bono, E. (1996). The 5-day course in thinking. Penguin Books.

Chicago Style (17th ed.) Citation

De Bono, Edward. The 5-day Course in Thinking. New York: Penguin Books, 1996.

MLA (8th ed.) Citation

De Bono, Edward. The 5-day Course in Thinking. Penguin Books, 1996.