Stutely, R. (1991). The Economist Numbers Guide: The Essentials of Business Numeracy (6th ed.). Profile Books Ltd.
Lua i Stíl Chicago (17ú heag.)Stutely, Richard. The Economist Numbers Guide: The Essentials of Business Numeracy. 6th ed. London: Profile Books Ltd, 1991.
Lua MLA (9ú heag.)Stutely, Richard. The Economist Numbers Guide: The Essentials of Business Numeracy. 6th ed. Profile Books Ltd, 1991.
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