Dyfyniad APA

Baumol, W. J. (1991). Economics: Principles and policy (Fifth edition.). Harcourt Brace Jovanovich.

Dyfyniad Arddull Chicago

Baumol, William J. Economics: Principles and Policy. Fifth edition. San Diego: Harcourt Brace Jovanovich, 1991.

Dyfyniad MLA

Baumol, William J. Economics: Principles and Policy. Fifth edition. Harcourt Brace Jovanovich, 1991.

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