Samael, L., and S.- arun Isaramalai. “Correlation Factors Between Job Operational Characteristics and Job Satisfaction of Nurses in Primary Care Units: Service Area 12, Thailand”. Princess of Naradhiwas University Journal, vol. 12, no. 3, Sept. 2020, pp. 155-74, https://li01.tci-thaijo.org/index.php/pnujr/article/view/242606.