De Bono, E. (1993). Sur/petition: Creating value monopolies when everyone else is merely competing. HarperBusiness, Profile Books.
Lua i Stíl Chicago (17ú heag.)De Bono, Edward. Sur/petition: Creating Value Monopolies When Everyone Else Is Merely Competing. New York, NY : London: HarperBusiness, Profile Books, 1993.
Lua MLA (8ú heag.)De Bono, Edward. Sur/petition: Creating Value Monopolies When Everyone Else Is Merely Competing. HarperBusiness, Profile Books, 1993.
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