Cita APA (7th ed.)

De Bono, E. (1999). Six thinking hats (Rev. and updated ed.). Back Bay Books.

Cita Chicago (17th ed.)

De Bono, Edward. Six Thinking Hats. Rev. and updated ed. Boston: Back Bay Books, 1999.

Cita MLA (9th ed.)

De Bono, Edward. Six Thinking Hats. Rev. and updated ed. Back Bay Books, 1999.