Harnthong, P., S. Sarnswang, and P. Buasuwan. “The Relationship Between Administrators’ Instructional Leadership and Teachers’ Self-Efficacy of District Learning Encouragement Center under Nonthaburi Office of Learning Encouragement”. Suan Dusit Graduate School Academic Journal, vol. 21, no. 3, Oct. 2025, pp. 59-70, https://so19.tci-thaijo.org/index.php/SDUGSAJ/article/view/1227.