CHUM-ONGWA, K.; WONGCHALEE, P.; SUWANNATRAI, K. Comparison of Science Process Skills and Learning Achievement of Grade 9 Students on the Topic of Life and Environment and Natural Resources by Using the Principles of Sufficiency Economy and Conventional methods. Journal of Roi Et Rajabhat University, [S. l.], v. 14, n. 1, p. 15–26, 2020. Disponível em: https://so03.tci-thaijo.org/index.php/reru/article/view/209576. Acesso em: 16 sep. 2026.