APA (7th ed.) Citation

De Bono, E. (1985). Six thinking hats (1st U.S. ed.). Little, Brown.

Chicago Style (17th ed.) Citation

De Bono, Edward. Six Thinking Hats. 1st U.S. ed. Boston: Little, Brown, 1985.

MLA (9th ed.) Citation

De Bono, Edward. Six Thinking Hats. 1st U.S. ed. Little, Brown, 1985.