APA (7th ed.) Citation

De Bono, E. (1967). The 5 day course in thinking. Penguin Books.

Chicago Style (17th ed.) Citation

De Bono, Edward. The 5 Day Course in Thinking. Middlesex, Eng: Penguin Books, 1967.

MLA (9th ed.) Citation

De Bono, Edward. The 5 Day Course in Thinking. Penguin Books, 1967.