WASET
Prasitturattanachai, W. , Nuithitikul, K. (2013). 'Esterification of Free Fatty Acids in Crude Palm Oil Using Alumina-Doped Sulfated Tin Oxide as a Catalyst'. World Academy of Science, Engineering and Technology, Open Science Index 79, International Journal of Chemical and Molecular Engineering, 7(7), 527 - 531.