Arafat, S., and A. E. Cahyono. “PENERAPAN MODEL PEMBELAJARAN NUMBERED HEAD TOGETHER (NHT) UNTUK MENINGKATKAN HASIL BELAJAR”. Education Journal : Journal Educational Research and Development, vol. 2, no. 2, Oct. 2018, pp. 53-63, https://jurnal.unipar.ac.id/index.php/ej/article/view/113.