Dyfyniad APA

Melvin, M. &. B. (2013). Principles of Economics (9th.). Cengage Learning.

Dyfyniad Arddull Chicago

Melvin, Michael & Boyes. Principles of Economics. 9th. Canada: Cengage Learning, 2013.

Dyfyniad MLA

Melvin, Michael & Boyes. Principles of Economics. 9th. Cengage Learning, 2013.

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