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Dyfyniad Arddull ChicagoNational Research Council (U.S.). Committee on Sustainable Agriculture and the Environment in the Humid Tropics and Inc ebrary. Sustainable Agriculture and the Environment in the Humid Tropics. Washington, D.C.: National Academy Press, 1993.
Dyfyniad MLANational Research Council (U.S.). Committee on Sustainable Agriculture and the Environment in the Humid Tropics and Inc ebrary. Sustainable Agriculture and the Environment in the Humid Tropics. National Academy Press, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.