Wonnacott, P., & Wonnacott, R. (1990). Economics (4th ed.). John Wiley and Sons.
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Dyfyniad Arddull Chicago
Wonnacott, Paul, and Ronald Wonnacott. Economics. 4th ed. New York: John Wiley and Sons, 1990.
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Dyfyniad MLA
Wonnacott, Paul, and Ronald Wonnacott. Economics. 4th ed. John Wiley and Sons, 1990.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.