APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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