Ismanto, Ismanto, and Hartono Hartono. “Keefektifan Model STAD Dan Direct Learning Berdasarkan Prestasi Dan Minat Belajar Matematika Materi Kesebangunan Bangun Datar”. PYTHAGORAS Jurnal Matematika dan Pendidikan Matematika 9, no. 2 (December 10, 2014): 147–160. Accessed July 11, 2025. https://journal.uny.ac.id/index.php/pythagoras/article/view/9076.