DeBono Edward. (2010). Free Mind: Lateral Thinking Approach. Jaico Publishing House.
Lua i Stíl Chicago (17ú heag.)DeBono Edward. Free Mind: Lateral Thinking Approach. Ahmedabad: Jaico Publishing House, 2010.
Lua MLA (9ú heag.)DeBono Edward. Free Mind: Lateral Thinking Approach. Jaico Publishing House, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.