Hongkong, N. . and Bailee, C. . (2020) “The Relationship Between Ethical Leadership of the Principals with Happiness for Teacher in School Under the Office of Udonthani Primary Education Service Area”, Journal of Graduate Research, 11(1), pp. 135–148. Available at: https://so02.tci-thaijo.org/index.php/banditvijai/article/view/223691 (Accessed: 20 April 2024).