Cita APA (7a ed.)

Bono, E. (1999). Six thinking hats. Back Bay Books.

Cita Chicago Style (17a ed.)

Bono, Edward. Six Thinking Hats. New York: Back Bay Books, 1999.

Cita MLA (9a ed.)

Bono, Edward. Six Thinking Hats. Back Bay Books, 1999.