1. Hassan, M. A., Yacob, S., Shirai, Y., & Hung, Y. T. (2004). Treatment of palm oil wastewaters. In L. K. Wang, Y. T. Hung, H. H. Lo, & C. Yapijakis (Eds.), Handbook of industrial and hazardous wastes treatment. United States of America. Marcel Drekker, Inc.
2. Ma, A. N. (1999). Treatment of palm oil mill effluent. In G. Singh, K. H. Lim, T. Leng, & L. K. David (Eds.), Oil palm and the environment: A Malaysian perspective (pp. 113–126). Malaysian Oil Palm Growers’ Council.
3. Ahmad, A. L., Ismail, S., & Bhatia, S. (2003). Water recycling from palm oil mill effluent (POME) using membrane technology. Desalination, 157, 87–95.
4. Hwang, T. K. (1978). Chemical composition of palm oil mill effluents. Planter, 54, 749–756.
5. Onoja, E., Chandren, S., Abdul Razak, F. I., Mahat, N. A., & Abdul Wahab, R. (2018). Oil Palm (Elaeis guineensis) biomass in Malaysia: The present and future prospects. Waste and Biomass Valorization.