De Bono, E. (1978). Opportunities: A handbook of business opportunity search. Associated Business Programmes.
Lua i Stíl Chicago (17ú heag.)De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. London: Associated Business Programmes, 1978.
Lua MLA (9ú heag.)De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. Associated Business Programmes, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
