P. Phattaratanachit, D. Boonprajak, and K. Sokuma, “Development of the Mathematics Learning Achievement on GCD (Greatest Common Divisor ) and LCM ( Least Common Multiple) Problems of Mathayom Suksa 1 Students Using Simulation Based Learning Phranakhon Rajabhat University”, JAR, vol. 26, no. 1, pp. 315–326, May 2021.