Grasung, P., J. Thappha, and J. Pholsit. “Predictive Factors towards Behavior in Practice to Prevent COVID-19 in the Area of Phra Nakhon Si Ayutthaya City Municipality”. The Journal of Chulabhorn Royal Academy, vol. 4, no. 3, July 2022, pp. 141-50, https://he02.tci-thaijo.org/index.php/jcra/article/view/256698.