Jintawat Tanamatayarat และ Kwan Arayathanitkul. (2011) Developing the demonstration sets for enhancing students' conceptions in the properties of laser beam. Mahidol University:ม.ป.ท.Jintawat Tanamatayarat และ Kwan Arayathanitkul. 2011. Developing the demonstration sets for enhancing students' conceptions in the properties of laser beam. ม.ป.ท.:Mahidol University;Jintawat Tanamatayarat และ Kwan Arayathanitkul. Developing the demonstration sets for enhancing students' conceptions in the properties of laser beam. ม.ป.ท.:Mahidol University, 2011. Print.