Surat Batak: Perbedaan antara revisi

* {{cite journal|url=https://brill.com/view/journals/bki/149/3/article-p593_8.xml?crawler=true|first=René |last=Teygeler |title=Pustaha; A study into the production process of the Batak book|journal=Bijdragen tot de Taal-, Land- en Volkenkunde|vol=149|issue=3|page=593-611|date=01-01-1 Januari 1993|place=Leiden|publisher=KITLV, Royal Netherlands Institute of Southeast Asian and Caribbean Studies|language=EN|volume=149|issn=0006-2294}}