WASET
A.Rauf, M. , I.Shehadeh, I. , Ahmed, A. , Al-Zamly, A. (2009). 'Removal of Methylene Blue from Aqueous Solution by Using Gypsum as a Low Cost Adsorbent'. World Academy of Science, Engineering and Technology, Open Science Index 31, International Journal of Chemical and Molecular Engineering, 3(7), 369 - 374.