Samuelson, P. A., & Nordhaus, W. D. (2010). Economics (19th ed.). McGraw-Hill.
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Dyfyniad Arddull Chicago
Samuelson, Paul A., and William D. Nordhaus. Economics. 19th ed. New York: McGraw-Hill, 2010.
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Dyfyniad MLA
Samuelson, Paul A., and William D. Nordhaus. Economics. 19th ed. McGraw-Hill, 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.