ภิญโญธีระดา. 2019. “THE SERVANT LEADERSHIP OF SCHOOL ADMINISTRATORS UNDER THE OFFICE OF THE SECONDARY EDUCATIONAL SERVICE AREA 3, NONTHABURI PROVINCE”. Panyapiwat Journal 11 (1), 207-20. https://www.tci-thaijo.org/index.php/pimjournal/article/view/186143.