สิงห์คำ นิภาพรรณ์, ชมภูคำ วีระศักดิ์, and ชมภูคำ พิชญ์สินี. “Development of Mathematics Activity Through Cooperative Learning With the Geometer’s Sketchpad Program to Encourage Learning Achievement and Creative Thinking Skills of Mathayomsuksa 2 Students”. Journal of Graduate Research 9, no. 2 (December 25, 2018): 1–20. Accessed March 29, 2024. https://so02.tci-thaijo.org/index.php/banditvijai/article/view/133933.