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G. Singh, . and C. H. Lim, . and K. H. Lim, . and Teo Leng, . (2009) Production of organic fertilisers and soil conditioners. In: Sustainable production of palm oil: a Malaysian perspective. 2nd ed. . Prinsip Taktik Sdn Bhd, Kuala Lumpur Malaysia, pp. 317-337. ISBN 978-983-3063-01-7
Gurmit Singh, . and Lim Kim Huan, . and Teo Leng, . and Chan Kook Weng, . (2009) Sustainable production of palm oil: a Malaysian perspective. Prinsip Taktik Sdn Bhd, Kuala Lumpur Malaysia. ISBN 978-983-3063-01-7
