APA
De Bono E., . (1971). Practical Thinking. London: Penguin Books.
Chicago
De Bono Edward, . 1971. Practical Thinking. London: Penguin Books.
Harvard
De Bono E., . (1971). Practical Thinking. London: Penguin Books.
MLA
De Bono Edward, . Practical Thinking. London: Penguin Books. 1971.