ภิญโญธ. “THE SERVANT LEADERSHIP OF SCHOOL ADMINISTRATORS UNDER THE OFFICE OF THE SECONDARY EDUCATIONAL SERVICE AREA 3, NONTHABURI PROVINCE”. Panyapiwat Journal, Vol. 11, no. 1, Apr. 2019, pp. 207-20, https://www.tci-thaijo.org/index.php/pimjournal/article/view/186143.