DE BONO EDWARD. (1987). LETTERS TO THINKERS: FURTHER THOUGHTS ON LATERAL THINKING. HARRAP LIMITED.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDE BONO EDWARD. LETTERS TO THINKERS: FURTHER THOUGHTS ON LATERAL THINKING. LONDON: HARRAP LIMITED, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDE BONO EDWARD. LETTERS TO THINKERS: FURTHER THOUGHTS ON LATERAL THINKING. HARRAP LIMITED, 1987.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.