“Pengaruh Penerapan Model Pembelajaran Kooperatif Teknik Berkirim Salam Dan Soal Terhadap Kemampuan Pemahaman Matematis Siswa SMP”. Jurnal Ilmiah Mandala Education 4, no. 2 (October 14, 2018): 189–194. Accessed September 20, 2026. https://ejournal.mandalanursa.org/index.php/JIME/article/view/421.