APA (7th ed.) Citation

De Bono, E. (2000). Six thinking hats (Revised and updated [edition].). Penguin Life, an Imprint of Penguin Books.

Chicago Style (17th ed.) Citation

De Bono, Edward. Six Thinking Hats. Revised and updated [edition]. [London]: Penguin Life, an Imprint of Penguin Books, 2000.

MLA (9th ed.) Citation

De Bono, Edward. Six Thinking Hats. Revised and updated [edition]. Penguin Life, an Imprint of Penguin Books, 2000.