Dyfyniad APA

Samuelson,Paul A. (2010). Economics (19th.). McGraw Hill Education.

Dyfyniad Arddull Chicago

Samuelson,Paul A. Economics. 19th. New York: McGraw Hill Education, 2010.

Dyfyniad MLA

Samuelson,Paul A. Economics. 19th. McGraw Hill Education, 2010.

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