C. W. Ginting and D. P. Sinaga, “Perbandingan hasil belajar siswa dengan menggunakan model pembelajaran Group Investigation (GI) DanThink Talk Write (TTW) Pada Materi Evolusi: Comparison of student learning outcomes using the learning model Group Investigation (GI) And Think Talk Write (TTW) on Evolutionary Materials”, JMO, vol. 3, no. 1, pp. 54–60, Apr. 2021.