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Dyfyniad Arddull ChicagoLee, T. H. Agricultural Diversification and Development. New York: SEADAG of the Asia Society, 1971.
Dyfyniad MLALee, T. H. Agricultural Diversification and Development. SEADAG of the Asia Society, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.