APA (7e ed.) Bronvermelding

De Bono, E. (1978). Opportunities: A handbook of business opportunity search. Associated Business Programmes.

Chicago (17e ed.) Bronvermelding

De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. London: Associated Business Programmes, 1978.

MLA (9e ed.) Bronvermelding

De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. Associated Business Programmes, 1978.