Waroonroj, J., & Chamarat, S. (2018). The Guidelines for Teacher Development on Classroom Research in Small-Sized Schools under the KhonKaen Primary Educational Service Area Office 1. Dhammathas Academic Journal, 18(2), 111–120. retrieved from https://so06.tci-thaijo.org/index.php/dhammathas/article/view/121975