Niramon Utama-ang. (2006) Development of Jiaogulan tea [Gynostemma pentaphyllum] /. Kasetsart University,:ม.ป.ท.Niramon Utama-ang. 2006. Development of Jiaogulan tea [Gynostemma pentaphyllum] /. ม.ป.ท.:Kasetsart University,;Niramon Utama-ang. Development of Jiaogulan tea [Gynostemma pentaphyllum] /. ม.ป.ท.:Kasetsart University, 2006. Print.