1. Abdul Razak, LZ., (1993). Atmospheric stability and wind profile in UPM, Project Report, Universiti Putra Malaysia, Malaysia.
2. Cheang (1991). Haze Episode October 1991. Malaysian Meteorological Service Information Paper No. 2.
3. Chow, K.K., Lim, J.T. (1983). Monitoring of suspended particles in Petaling. In: Urbanization and Ecodevelopment with Special Reference to Kuala Lumpur, Institute for Advanced Study, University of Malaya, Kuala Lumpur, 178–185.
4. Chuah T.G., Abdul Ghani, W.A., Robiah, Y. and Rozita, O., (2006). Biomass as the renewable energy sources in malaysia: an overview. Int. J. of Green Energy, 3, 323–346.
5. Department of the Environment, Malaysia (DOE), (1999). Malaysia Environmental Quality Report. Department of Environment, Ministry of Science, Technology and Environment, Malaysia.