Rueanphibun , Areewan. “GUIDELINES FOR THE MANAGING LEARNING ENVIRONMENT OF DISTRICT SERVICE UNITS, UTTARADIT SPECIAL EDUCATION CENTER”. Journal of MCU Nakhondhat 9, no. 8 (August 31, 2022): 146–161. Accessed April 27, 2024. https://so03.tci-thaijo.org/index.php/JMND/article/view/263276.