Simmalee, N., W. Chalakbang, and P. Steannoppakao. “Leadership Behavior of Directors Child Care Centers Affecting Caregiver Teachers Morale under the Local Administrative Organizations in Nakhon Phanom Province”. Journal of Education Rajabhat Maha Sarakham University, vol. 18, no. 1, Feb. 2021, pp. 105-18, https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/251567.