SIMANGUNSONG, R. Profil Youth Worker: Hendriek Rudolf Mergart. Jurnal Youth Ministry (2013-2016), [S. l.], v. 1, n. 1, p. 46–49, 2013. Disponível em: http://165.22.100.199/index.php/JYM/article/view/83. Acesso em: 7 feb. 2026.