Hishamuddin, E., Foo, C. Y., Mohd Yunus, R., Lim, L. P., & Ripin, A. (2001). Decolourization of recovered base oil from used lubricant oil: A study on the performance of composite adsorbents. Faculty of Chemical and Natural Resources Engineering, UTM.

Hishamuddin, Elina, Chwan Yee Foo, Rosli Mohd Yunus, Lee Ping Lim, and Adnan Ripin. Decolourization of Recovered Base Oil From Used Lubricant Oil: A Study On the Performance of Composite Adsorbents. Faculty of Chemical and Natural Resources Engineering, UTM, 2001.

Hishamuddin, Elina, et al. Decolourization of Recovered Base Oil From Used Lubricant Oil: A Study On the Performance of Composite Adsorbents. Faculty of Chemical and Natural Resources Engineering, UTM, 2001.