Srijuntrapun, P., and A. Chaiboonchoe. “The Study of Quantity of Household Waste during the Coronavirus (COVID-19) Outbreak”. University of the Thai Chamber of Commerce Journal Humanities and Social Sciences, vol. 41, no. 2, June 2021, pp. 1-17, https://so06.tci-thaijo.org/index.php/utccjournalhs/article/view/245881.