Johann Angerler
Images of god in toba batak storytelling / Johann Angerler
University of Indonesia, Faculty of Humanities, 2016
 Artikel Jurnal
Johann Angerler
Images of God in Toba Batak storytelling / Johann Angerler
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2016
 Artikel Jurnal
Tuuk, H.N. van der
A grammar of Toba Batak
Martinus Nijhoff, 1971
 Buku Teks
Warneck, Joh.
Toba-Batak-Deutsches worterbuch
Martinus Nijhoff, 1977
 Buku Referensi
Warneck, Joh
Toba-Batak-Deutsches Worterbuch / Joh Warneck
Martinus Nijhoff, 1977
 Buku Teks