Ekkasit Tepveeragul และ Somchai Pengprecha. (2012) Purification of biodiesel by adsorption with acid activated bentonite. Chulalongkorn University:ม.ป.ท.Ekkasit Tepveeragul และ Somchai Pengprecha. 2012. Purification of biodiesel by adsorption with acid activated bentonite. ม.ป.ท.:Chulalongkorn University;Ekkasit Tepveeragul และ Somchai Pengprecha. Purification of biodiesel by adsorption with acid activated bentonite. ม.ป.ท.:Chulalongkorn University, 2012. Print.