ศรีปากดี น., & ศรีพุทธรินทร์ ส. (2016). Situations of Implementation in Non-Formal Education Based on Students’ Perceptions under Non-Formal Education and Informal Education Center in Chanpen Sub-District, Tao-ngoi District, Sakon Nakhon Province. RMUTI Journal Humanities and Social Sciences, 3(1), 104–113. Retrieved from https://so05.tci-thaijo.org/index.php/RMUTI_SS/article/view/193664