Cita APA (7th ed.)

Bono, E. d. (1999). Six thinking hats (1a. ed.). Back Bay Books.

Cita Chicago (17th ed.)

Bono, Edward de. Six Thinking Hats. 1a. ed. Nueva York: Back Bay Books, 1999.

Cita MLA (9th ed.)

Bono, Edward de. Six Thinking Hats. 1a. ed. Back Bay Books, 1999.