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Dyfyniad Arddull ChicagoEnke, Stephen. Intermediate Economic Theory. New York: Prentice-Hall, 1950.
Dyfyniad MLAEnke, Stephen. Intermediate Economic Theory. Prentice-Hall, 1950.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.