Six thinking hats

MLA

De Bono, Edward. Six Thinking Hats. Revised and updated ed. London: Penguin Life, an imprint of Penguin Books, 2016.

APA

De Bono, E. (2016). Six thinking hats. Revised and updated ed. London: Penguin Life, an imprint of Penguin Books.

Chicago

De Bono, Edward, Six Thinking Hats. Revised and updated ed. London: Penguin Life, an imprint of Penguin Books, 2016.