Torang Siregar, Almira Amir, Lelya Hilda, Suparni and Anita Adinda (2023) “Determining the Surface Area of a Tube Using the Discovery Learning Model at SMP Negeri 5 Sinunukan”, COMPETITIVE: Journal of Education, 2(4), pp. 265–275. doi: 10.58355/competitive.v2i4.44.