Viriya, Phuangpornphat, Navin Meenakan, Phiphat Nonthnathorn, and Tipparat Laohavichien. 2020. “Factor Analysis of Social Marketing Factors towards the Environmental Friendly Products Buying Behavior of Consumers in Thailand”. Journal of the Association of Researchers 22 (1):67-80. https://so04.tci-thaijo.org/index.php/jar/article/view/242503.