Santoso, A., and N. Mutiara Sari. “Peningkatan Kemampuan Representasi Matematis Siswa Kelas X Melalui Pembelajaran Model Kooperatif Tipe Snowball Throwing”. Pasundan Journal of Mathematics Education, vol. 13, no. 1, May 2023, pp. 83-97, https://journal.unpas.ac.id/index.php/pjme/article/view/7411.