A grammar of Toba-Batak - Nababan, P. W. J.; Australian National University. Research School of Pacific Studies. Department of Linguistics; Linguistic Circle of Canberra (Canberra : Dept. of Linguistics, Research School of Pacific Studies, Australian National University for Linguistic Circle of Canberra, 1981)
Bibliography: p. 145-146.
Keywords: Batak language: Toba-Batak dialect. Grammar; Toba-batak dialect -- Grammar; Batak language -- Dialects