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Dyfyniad Arddull ChicagoMalaysia. Lembaga Pendaftaran dan Pelesenan Minyak Kelapa Sawit. Directory, Oil Palm Industry. Kuala Lumpur: PORLA, 1981.
Dyfyniad MLAMalaysia. Lembaga Pendaftaran dan Pelesenan Minyak Kelapa Sawit. Directory, Oil Palm Industry. PORLA, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.