Aris Ananta
Population projection 1995-2025 North Sumatra
Demographic Institute, Faculty of Economics, University of Indonesia, 1995
 Buku Teks
Brakel-Papenhuyzen, Clara
Oral literary traditions in north sumatra
Faculty of Humanities University of Indonesia, 2010
 Artikel Jurnal
Tropical coasts
PEMESA,
 Majalah, Jurnal, Buletin
The North East After Brexit
Emerald Publishing Limited, 2019
 eBooks
Reid, Anthony, 1939-
The contest for North Sumatra : Atjeh, the Netherlands, and Britain, 1858-1898
Oxford University Press, 1969
 Buku Teks