Samuelson, P. A., & Nordhaus, W. D. (1989). Economics (13. Edition.). McGraw-Hill.
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Citação norma Chicago
Samuelson, Paul A., and William D. Nordhaus. Economics. 13. Edition. New York: McGraw-Hill, 1989.
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Citação norma MLA
Samuelson, Paul A., and William D. Nordhaus. Economics. 13. Edition. McGraw-Hill, 1989.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.