Sebayang, Sry Ninta, Adena Siregar, dan Theresia Agustine Tuka. “Analysis of the Effectiveness of Using Concrete Media in Introducing Statistical Concepts in Elementary Schools”. Jurnal Merah Putih Sekolah Dasar 2, no. 3 (Desember 14, 2025). Diakses Desember 15, 2025. https://jurnal.unimed.ac.id/2012/index.php/jmpsd/article/view/69287.