Byrns, R. T., & Stone, G. W. (1992). Economics (5th ed.). HarperCollins College Pub..
Tohutoru Kātū Chicago (17th ed.)Byrns, Ralph T., me Gerald W. Stone. Economics. 5th ed. New York: HarperCollins College Pub., 1992.
Tohutoro MLA (9th ed.)Byrns, Ralph T., me Gerald W. Stone. Economics. 5th ed. HarperCollins College Pub., 1992.
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