Husna, N., and N. Nurhasanah. “Development of a Didactical Design Based on Research and Development for Teaching Cones and Cylinders to Improve Junior High School Students’ Conceptual Understanding”. Interval: Indonesian Journal of Mathematical Education, Vol. 4, no. 1, May 2026, pp. 26-31, doi:10.37251/ijome.v4i1.3211.