Samuelson, P. A., & Nordhaus, W. D. (1989). Economics (13th ed.). McGraw-Hill Book.
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Tohutoru Kātū Chicago (17th ed.)
Samuelson, Paul A., me William D. Nordhaus. Economics. 13th ed. New York: McGraw-Hill Book, 1989.
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Tohutoro MLA (9th ed.)
Samuelson, Paul A., me William D. Nordhaus. Economics. 13th ed. McGraw-Hill Book, 1989.
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