Sufena, Erfan, Suyono Suyono, and Lukman Hakim. “Pengaruh Penerapan Metode Kooperatif Tipe Investigasi Kelompok Terhadap Kemampuan Komunikasi Matematis Dan Self Confidence Siswa SMP”. Journal of Mathematics Learning 1, no. 1 (February 9, 2018): 27-38. Accessed April 20, 2025. http://jml.ejournal.id/index.php/penmat/article/view/3.