1. Malaysia Environmental Quality Report 2014;DOE,2015
2. Malaysia Environmental Quality Report 2006;DOE,2006
3. Industrial Combustion Pollution and Control;Baukal,2003
4. Controlling NOx emissions part 1;Bradford;Chem. Eng. Prog.,2002
5. Testing biological methods to treat rubber effluent;Iyagba;Afr. J. Agric. Res.,2008