Sihombing, Aeron Frior. “PENDIDIKAN KARAKTER DALAM KOTBAH DI BUKIT”. Regula Fidei : Jurnal Pendidikan Agama Kristen, vol. 4, no. 1, Jan. 2020, pp. 38-56, http://christianeducation.id/e-journal/index.php/regulafidei/article/view/31.