Sugeng, Sugeng. “Penyetaraan Vertikel Model Kredit Parsial Soal Matematika SMP”. Jurnal Penelitian dan Evaluasi Pendidikan 14, no. 2 (January 11, 2013). Accessed June 6, 2025. https://jurnal.uny.ac.id/index.php/jpep/article/view/1083.