Dyfyniad APA

Boyes,William, & Melvin,Michael. (2003). Principles of Economics. Cengage Learning.

Dyfyniad Arddull Chicago

Boyes,William, and Melvin,Michael. Principles of Economics. Australia: Cengage Learning, 2003.

Dyfyniad MLA

Boyes,William, and Melvin,Michael. Principles of Economics. Cengage Learning, 2003.

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