Spencer, M. H., & Amos, O. M. (1993). Contemporary microeconomics (8th ed.). Worth Publishers.
Lua i Stíl Chicago (17ú heag.)Spencer, Milton H., agus Orley M. Amos. Contemporary Microeconomics. 8th ed. New York, N.Y.: Worth Publishers, 1993.
Lua MLA (8ú heag.)Spencer, Milton H., agus Orley M. Amos. Contemporary Microeconomics. 8th ed. Worth Publishers, 1993.
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