Martina Labora Nainggolan, Putra Rajagukguk, Marthalena Lumbangaol, Eniwati Nduru, Rainaldi Setiawan, and Hisardo Sitorus, “Personal Branding Guru Agama Kristen”, JURRIBAH, vol. 5, no. 1, pp. 13–23, Jan. 2026.