Pongsakon Ponpai และผู้แต่งคนอื่นๆ. (2017) Improved Illumination model of LED street light at Rajamangala University of Technology Lanna, Chiang Rai. <i>RMUTL Engineering Journal</i>, <i>2</i>(2), 25-36.Pongsakon Ponpai และผู้แต่งคนอื่นๆ. "Improved Illumination model of LED street light at Rajamangala University of Technology Lanna, Chiang Rai". RMUTL Engineering Journal 2 (2017):25-36.Pongsakon Ponpai และผู้แต่งคนอื่นๆ. Improved Illumination model of LED street light at Rajamangala University of Technology Lanna, Chiang Rai. Rajamangala University of Technology Lanna:ม.ป.ท. 2017.