De Bono, E. (1978). Opportunities: A handbook of business opportunity search. Associated Business Programmes.
Chicago-referens (17:e uppl.)De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. London: Associated Business Programmes, 1978.
MLA-referens (9:e uppl.)De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. Associated Business Programmes, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.
