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Tohutoro APA (7th ed.)
Ragan, J. F., & Thomas, L. B. (1990). Principles of economics (ed.). Harcourt Brace Jovanovich.
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Tohutoru Kātū Chicago (17th ed.)
Ragan, James F., me Lloyd B. Thomas. Principles of Economics. ed. San Diego: Harcourt Brace Jovanovich, 1990.
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Tohutoro MLA (9th ed.)
Ragan, James F., me Lloyd B. Thomas. Principles of Economics. ed. Harcourt Brace Jovanovich, 1990.
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