Yodthong, Thuchapon. “The Leadership of School Administrators Affecting Competitiveness: A Case Study of Secondary Schools in Nonthaburi”. The International Journal of Humanities & Social Studies 4, no. 2 (February 29, 2016). Accessed July 22, 2024. https://internationaljournalcorner.com/index.php/theijhss/article/view/125904.