Dyfyniad APA

Samuelson,Paul A, Nordhaus,William D, Sudip Chaudhuri, & Anindya Sen. (2020). Economics (20th ed.). McGraw Hill.

Dyfyniad Arddull Chicago

Samuelson,Paul A, Nordhaus,William D, Sudip Chaudhuri, and Anindya Sen. Economics. 20th ed. Chennai: McGraw Hill, 2020.

Dyfyniad MLA

Samuelson,Paul A, et al. Economics. 20th ed. McGraw Hill, 2020.

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