Huda, K., R. Rochmad, and S. Supriyadi. “Kemampuan Aljabar Siswa Pada Pembelajaran Kooperatif Berbasis Concept Mapping”. Unnes Journal of Mathematics Education Research, Vol. 6, no. 1, Aug. 2017, pp. 68-75, https://journal.unnes.ac.id/sju/ujmer/article/view/17242.