Nantana Klinsunthorn และ Thumnoon Nhujak. (2010) Sample preparation for determination of steroids dulterated in herbal medicines by high performance liquid chromatography. Chulalongkorn University:ม.ป.ท.Nantana Klinsunthorn และ Thumnoon Nhujak. 2010. Sample preparation for determination of steroids dulterated in herbal medicines by high performance liquid chromatography. ม.ป.ท.:Chulalongkorn University;Nantana Klinsunthorn และ Thumnoon Nhujak. Sample preparation for determination of steroids dulterated in herbal medicines by high performance liquid chromatography. ม.ป.ท.:Chulalongkorn University, 2010. Print.