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Dyfyniad Arddull ChicagoPerkins,Dwight H. Agriculture Development in China 1368-1968. Edinburg: University Press, 1969.
Dyfyniad MLAPerkins,Dwight H. Agriculture Development in China 1368-1968. University Press, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.