“Training of Luper Borubung (Surface Area of a Sphere, Cone, Cylinder) Demonstration Tools on the Surface Area of Curved Sided Template Figures (BRSL)” (2026) JISIP (Jurnal Ilmu Sosial dan Pendidikan), 10(1), pp. 367–374. doi:10.58258/jisip.v10i1.9958.