J.S. Aritonang, Mission schools in Batakland (Indonesia) 1861-1940. BMGN - Low Countries Historical Review, [S. l.], v. 111, n. 1, p. 112–114, 1996. DOI: 10.18352/bmgn-lchr.4200. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104827.. Acesso em: 22 nov. 2024.