เทียมชีวะศิลป์ ภ. (2019) “Competitiveness Advantage Model of Plastic Industry in Phra Nakhon Si Ayutthaya Province”, Pathumthani University Academic Journal, 11(2), pp. 277–290. available at: https://so05.tci-thaijo.org/index.php/ptujournal/article/view/219069 (accessed: 28 September 2026).