Woollams, Geoff. 2006. Karo Batak. In Adelaar, Alexander and Himmelman, Niklaus (eds.) 534–561. 1st edn. Routledge.
@inbook{1665_btx_karobatak1, author = {Woollams, Geoff}, booktitle = {The Austronesian Languages of Asia and Madagascar}, chapter = {19}, edition = {1st}, editor = {Adelaar, Alexander and Himmelman, Niklaus}, pages = {534–561}, publisher = {Routledge}, series = {Routledge Language Family Series}, title = {Karo Batak}, year = {2006} }