DZULFIKAR, Ahmad. MEREDUKSI KECEMASAN MATEMATIKA SISWA SMP MELALUI IMPLEMENTASI COOPERATIVE LEARNING TIPE GROUP INVESTIGATION. Mathline : Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 1, n. 1, p. 1–13, 2016. DOI: 10.31943/mathline.v1i1.8. Disponível em: http://mathline.unwir.ac.id/index.php/Mathline/article/view/8. Acesso em: 17 jan. 2026.