DE BONO EDWARD. (1978). OPPORTUNITIES: A HANDBOOK OF BUSINESS APPORTUNITY SEARCH. PENGUIN BOOKS INDIA (P) LTD.
Lua i Stíl Chicago (17ú heag.)DE BONO EDWARD. OPPORTUNITIES: A HANDBOOK OF BUSINESS APPORTUNITY SEARCH. ENGLAND: PENGUIN BOOKS INDIA (P) LTD, 1978.
Lua MLA (9ú heag.)DE BONO EDWARD. OPPORTUNITIES: A HANDBOOK OF BUSINESS APPORTUNITY SEARCH. PENGUIN BOOKS INDIA (P) LTD, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.