Warren, C.P. 1975. Batak. In Lebar, F.M. (ed.), Ethnic Groups of Insular Southeast Asia (Volume 2: Philippines and Formosa), 68-70. New Haven, CT: Human Relations Area Files.
@incollection{warren1975b, address = {New Haven, CT}, author = {Warren, C.P.}, booktitle = {Ethnic Groups of Insular Southeast Asia (Volume 2: Philippines and Formosa)}, editor = {Lebar, F.M.}, pages = {68-70}, publisher = {Human Relations Area Files}, title = {Batak}, year = {1975} }