Arunperm, T., and C. Sriruecha. “Administrative Factors and Management Processes Affecting Functional Competencies of the Head of Health Center in Kalasin Province”. Asia-Pacific Journal of Science and Technology, vol. 16, no. 8, Apr. 2017, pp. 1043-5, https://so01.tci-thaijo.org/index.php/APST/article/view/83633.