Sikes, E. R. (1951). Contemporary economic systems: By Earl Ray Sikes (Rev. ed.). Holt.
Cita Chicago Style (17a ed.)Sikes, Earl Ray. Contemporary Economic Systems: By Earl Ray Sikes. Rev. ed. New York: Holt, 1951.
Cita MLA (9a ed.)Sikes, Earl Ray. Contemporary Economic Systems: By Earl Ray Sikes. Rev. ed. Holt, 1951.
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