BONO EDWARD DE. (1990). LATERAL THINKING: TEXTBOOK OF CREATIVITY. PENFUIN BOOKS.
Lua i Stíl Chicago (17ú heag.)BONO EDWARD DE. LATERAL THINKING: TEXTBOOK OF CREATIVITY. ENGLAND: PENFUIN BOOKS, 1990.
Lua MLA (9ú heag.)BONO EDWARD DE. LATERAL THINKING: TEXTBOOK OF CREATIVITY. PENFUIN BOOKS, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.