APA način citiranja (7. izdanje)
De Bono, E. (1991). Opportunities: A handbook of business opportunity search. Penguin Books.
Čikaški stil citiranja (17. izdanje)
De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. London: Penguin Books, 1991.
MLA način citiranja (9. izdanje)
De Bono, Edward. Opportunities: A Handbook of Business Opportunity Search. Penguin Books, 1991.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.