Thaweecheep, C. ., and P. . Eagjariyakorn. “Legal Measures for the Eco-Friendly Products and Services Procurement of Thailand’s Government Sector”. Rajapark Journal, vol. 15, no. 41, July 2021, pp. 101-13, https://so05.tci-thaijo.org/index.php/RJPJ/article/view/250640.