Cita APA (7a ed.)

De Bono, E. (1967). The 5 Day Course in Thinking. Penguin Books.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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