Angganapattarakajorn, V. (2024). Development of Mathematical Concepts about Statistics Using the Concept Formation Model together with Concept-Rich Instruction and Higher-Order Questions for Undergraduate Students Majoring in Mathematics. Journal of Research and Curriculum Development, 14(1), 19–30. retrieved from https://so03.tci-thaijo.org/index.php/jrcd/article/view/272303