J.S. Aritonang, Mission schools in Batakland (Indonesia) 1861-1940. BMGN-LCHR [Internet]. 1996 Jan. 1 [cited 2024 Nov. 22];111(1):112-4. Available from: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104827