Changjun, K., & Khayankij, S. (2022). State and Problems of Distance Learning Instructional Management in the Covid-19 Situation of Preschool Teachersin School under Lopburi Primary Educations Service Area Office 1. An Online Journal of Education, 17(2), OJED1702021 (15 pages). Retrieved from https://so01.tci-thaijo.org/index.php/OJED/article/view/260506