D. J. Panjaitan, F. Firmansyah, A. Sapta, R. Aprilia, and A. F. P. Siregar, “DEVELOPMENT OF MATHEMATICS LEARNING USING BATAK CULTURE- BASED MEDIA IN INDONESIA”, Jur. Ilmh. Ilm. Ter. Un. Ja, vol. 9, no. 3, pp. 1249–1261, Aug. 2025.