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หยวกกุลศ, พูลพุทธาอ, ซุยกระเดื่องอ. Problems of Secondary School Teachers of Social Studies, Religion and Culture Department in Nongbua Lamphu Province for Implementing the Basic Education Core Curriculum B.E. 2551 (A.D. 2008). Journal of Roi Et Rajabhat University [Internet]. 29Apr.2019 [cited 20Aug.2019];13(1):49-8. Available from: https://www.tci-thaijo.org/index.php/reru/article/view/185942