Hakim, S. ., E. Effendi, and W. Widayanti. “Perbandingan Model Group Investigation Dan Number Head Together: Analisis Terhadap Hasil Belajar”. U-Teach: Journal Education of Young Physics Teacher, vol. 1, no. 1, July 2020, pp. 11-17, doi:10.30599/uteach.v1i1.18.