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Dyfyniad Arddull ChicagoHardin, Charles Meyer. Agricultural Policy, Politics and Public Interest. Philadelphia: American Academy of Political and Social Science, 1960.
Dyfyniad MLAHardin, Charles Meyer. Agricultural Policy, Politics and Public Interest. American Academy of Political and Social Science, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.