APA Citation

De Bono. (1990). PO: Beyond Yes or No. Harmondsworth: Penguin books.

Chicago Style Citation

De Bono. PO: Beyond Yes or No. Harmondsworth: Penguin books, 1990.

MLA Citation

De Bono. PO: Beyond Yes or No. Harmondsworth: Penguin books, 1990.

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