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Dyfyniad Arddull ChicagoCarla, Manuel, and M. Habibur Rahman. Urea Synthesis, Properties and Uses. Dhaka: ITN-Bangladesh, BUET, 2003.
Dyfyniad MLACarla, Manuel, and M. Habibur Rahman. Urea Synthesis, Properties and Uses. ITN-Bangladesh, BUET, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.