Natnicha Andara and Sutthiporn Boonsong. “The Development of the Primary 2 (Grade 2) Students Mathematic Learning Achievements by the Cippa Model”. International Journal of Advanced Science and Technology 29, no. 9s (May 3, 2020): 933 - 936. Accessed November 2, 2026. http://sersc.org/journals/index.php/IJAST/article/view/13352.