Prach Asavanarakul และผู้แต่งคนอื่นๆ. (2019) Design and Implementation of Ultrasonic Inverter for Use with Drilling Machine. <i>RMUTL Engineering Journal</i>, <i>4</i>(2), 36-44.Prach Asavanarakul และผู้แต่งคนอื่นๆ. "Design and Implementation of Ultrasonic Inverter for Use with Drilling Machine". RMUTL Engineering Journal 4 (2019):36-44.Prach Asavanarakul และผู้แต่งคนอื่นๆ. Design and Implementation of Ultrasonic Inverter for Use with Drilling Machine. Rajamangala University of Technology Lanna:ม.ป.ท. 2019.