Junthong, Phongyut. “Find the Best Shape and Hardness of Rubber Pad Used Printed on Plastic PET and PC”. Vocational Education Central Region Journal 5, no. 1 (June 29, 2021): 11-16. Accessed January 18, 2022. https://so06.tci-thaijo.org/index.php/IVECJournal/article/view/249118.