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M. Khalid Halimahtun, . and Tek Yong L., . and Bahar Nor Rozalita, . and Mohd Yusuff Rosnah, . and Che Doi Mohd Asyraf, . (2007) Proceedings of the agriculture ergonomics development conference. International Ergonomics Association Press, Kuala Lumpur Malaysia. ISBN 0-9768143-6-6