De Bono, E. (1990). PO: Beyond yes and no. London: Penguin Books.
Chicago Style CitationDe Bono, Edward. PO: Beyond Yes and No. London: Penguin Books, 1990.
MLA CitationDe Bono, Edward. PO: Beyond Yes and No. London: Penguin Books, 1990.
Warning: These citations may not always be 100% accurate.