APA (7th ed.) Citation

De Bono, E. (1986). Six thinking hats / Edward de Bono. Viking.

Chicago Style (17th ed.) Citation

De Bono, Edward. Six Thinking Hats / Edward De Bono. (Harmondsworth): Viking, 1986.

MLA (9th ed.) Citation

De Bono, Edward. Six Thinking Hats / Edward De Bono. Viking, 1986.

Warning: These citations may not always be 100% accurate.