Arrahmah Rianto, L., M. S. Lubis, dan Ammamiarihta. “PENGARUH GROUP INVESTIGATION DAN COOPERATIVE INTEGRATED READING AND COMPOSITION TERHADAP KEMAMPUAN BERPIKIR KRITIS”. Relevan : Jurnal Pendidikan Matematika, vol. 3, no. 2, April 2023, hlm. 228-32, https://ejournal.yana.or.id/index.php/relevan/article/view/846.