Dyfyniad APA

Boyes,William, & Melvin, M. (2003). Principles of economics (NA.). Cengage Learning.

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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