Debono Edward. (2000). Six Thinking Hats. Penguin.
Cita Chicago (17th ed.)Debono Edward. Six Thinking Hats. Penguin, 2000.
Cita MLA (9th ed.)Debono Edward. Six Thinking Hats. Penguin, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)