De Bono, E. (1990). Six thinking hats. london: Penguin Books.
Chicago Style CitationDe Bono, Edward. Six Thinking Hats. london: Penguin Books, 1990.
MLA CitationDe Bono, Edward. Six Thinking Hats. london: Penguin Books, 1990.
Warning: These citations may not always be 100% accurate.