Cita APA (7a ed.)

De Bono, E. W. (1999). Six Thinking Hats. Tata McGraw - Hill.

Cita Chicago Style (17a ed.)

De Bono, Ed Ward. Six Thinking Hats. New Delhi: Tata McGraw - Hill, 1999.

Cita MLA (9a ed.)

De Bono, Ed Ward. Six Thinking Hats. Tata McGraw - Hill, 1999.