Thaisawad, Porntap, Teerapong Doungthongkum, and Kitti Samackthai. 2018. “Design and Construction Plastic Injection LED FLASHLIGHT (Part Lens & Top Lens)”. Vocational Education Central Region Journal 2 (2):37-45. https://so06.tci-thaijo.org/index.php/IVECJournal/article/view/246523.