Waud, R. N. (1986). Economics (3rd ed.). Harper.
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Dyfyniad Arddull Chicago
Waud, Roger N. Economics. 3rd ed. New York: Harper, 1986.
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Dyfyniad MLA
Waud, Roger N. Economics. 3rd ed. Harper, 1986.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.