APA (7th ed.) Citation

DE BONO. (1990). Six thinking hats. Penguin.

Chicago Style (17th ed.) Citation

DE BONO. Six Thinking Hats. London: Penguin, 1990.

MLA (9th ed.) Citation

DE BONO. Six Thinking Hats. Penguin, 1990.

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