Kawkumpa, Supaluck, Thanakorn Saisema, Ornpavee Seoob, Chuleekorn Trakankit, Pornpen Atorngitjawat, and Wissawat Sakulsaknimitr. 2019. “Synthesis of Polyurethane from Glycolysis Product of PET Using ZnO As Catalyst”. RMUTSB ACADEMIC JOURNAL 7 (1). Phra Nakorn Sri Ayutthaya:29-39. https://li01.tci-thaijo.org/index.php/rmutsb-sci/article/view/150479.