WASET
Astuti, W. , Prasetya, A. , Wahyuni, E. , Bendiyasa, I. (2011). 'The Adsorption of Lead from Aqueous Solutions Using Coal Fly Ash : Effect of Crystallinity'. World Academy of Science, Engineering and Technology, Open Science Index 54, International Journal of Chemical and Molecular Engineering, 5(6), 506 - 511.