Dyfyniad APA

Samuelson, P. A., & Nordhaus, W. D. (2017). Economics (19th ed.). McGraw Hill Education.

Dyfyniad Arddull Chicago

Samuelson, Paul A., and William D. Nordhaus. Economics. 19th ed. Chennai: McGraw Hill Education, 2017.

Dyfyniad MLA

Samuelson, Paul A., and William D. Nordhaus. Economics. 19th ed. McGraw Hill Education, 2017.

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