Byrns, R. (1987). Economics (3rd ed.). Scott,Foresman.
Lua i Stíl Chicago (17ú heag.)Byrns, Ralph. Economics. 3rd ed. Illinois: Scott,Foresman, 1987.
Lua MLA (9ú heag.)Byrns, Ralph. Economics. 3rd ed. Scott,Foresman, 1987.
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