Korrawat Wuttikid และผู้แต่งคนอื่นๆ. (2018) Design and Invention of Cleaning Machine for Children Plastic Balls. <i>RMUTL Engineering Journal</i>, <i>3</i>(2), 8-14.Korrawat Wuttikid และผู้แต่งคนอื่นๆ. "Design and Invention of Cleaning Machine for Children Plastic Balls". RMUTL Engineering Journal 3 (2018):8-14.Korrawat Wuttikid และผู้แต่งคนอื่นๆ. Design and Invention of Cleaning Machine for Children Plastic Balls. Rajamangala University of Technology Lanna:ม.ป.ท. 2018.