Evi Susanti. “Pemberian Reward Dalam Proses Pembelajaran Pendidikan Agama Islam Di SMA Muhammadiyah Kabupaten Aceh Singkil”. Jurnal Al-Fikrah, vol. 5, no. 1, June 2016, pp. 42-55, https://ejournal.unisai.ac.id/index.php/jiaf/article/view/326.