[1]
K. Chum-ongwa, P. Wongchalee, and K. Suwannatrai, “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”, J Roi Et, vol. 14, no. 1, pp. 15–26, Apr. 2020.