Bumrungsri, S., and T. Chusak. “A Structural Equation Model of Factors Influencing Role Performance of Village Health Volunteers, Nakhon Sawan Province”. Journal of the Association of Researchers, vol. 22, no. 1, June 2020, pp. 124-36, https://so04.tci-thaijo.org/index.php/jar/article/view/242876.