Woollams, Geoffrey. 1996. A grammar of Karo Batak, Sumatra. (Pacific Linguistics, Series C, 130.)
@book{gasttdir-woollamsgrammar1996,
author = {Woollams, Geoffrey},
number = {130},
series = {Pacific Linguistics, Series C},
title = {A grammar of Karo Batak, Sumatra},
year = {1996}
}