Naranuphap, Saowalak, and Witsanu Attavanich. 2020. “Assessment of Willingness to Pay to Prevent Air Pollution from Particulate Matters 2.5 (PM2.5) in Bangkok”. Journal of Buddhist Education and Research 6 (2):295-30. https://so06.tci-thaijo.org/index.php/jber/article/view/243483.