Ruffin, R. J., & Gregory, P. R. (1993). Principles of Economics (5th Edition.). Harper Collins College Publishers.
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Citação norma Chicago
Ruffin, Roy J., and Paul R. Gregory. Principles of Economics. 5th Edition. New York: Harper Collins College Publishers, 1993.
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Citação norma MLA
Ruffin, Roy J., and Paul R. Gregory. Principles of Economics. 5th Edition. Harper Collins College Publishers, 1993.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.