Byrns, R. (1987). Economics (3rd ed.). Scott,Foresman.
Tohutoru Kātū Chicago (17th ed.)Byrns, Ralph. Economics. 3rd ed. Illinois: Scott,Foresman, 1987.
Tohutoro MLA (9th ed.)Byrns, Ralph. Economics. 3rd ed. Scott,Foresman, 1987.
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