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Dyfyniad Arddull ChicagoBalwinder, Singh, and G S. Dhaliwal. Pesticides: Thier Ecological Impact in Developing Countries. New Delhi: Commonwealth publishers, 1993.
Dyfyniad MLABalwinder, Singh, and G S. Dhaliwal. Pesticides: Thier Ecological Impact in Developing Countries. Commonwealth publishers, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.