1. Geological Map of the Sidikalang, Sumatra Quadrangle 0618, Scale 1:250.000;Aldiss,1983
2. The Geology of the Padangsidempuan and Sibolga area, Quadrangle 0617-0717, Scale 1:250.000;Apsden,1982
3. Penyelidikan geokimia panasbumi daerah Sipoholon Kabupaten Tapanuli Utara, Sumatra Utara;Ardiwinata,2005
4. Bannister, S., Bourguignon, S., Sherburn, S., Bertrand, T., 2015. 3-D Seismic velocity and attenuation in the Central Taupo Volcanic Zone, New Zealand: Imaging the roots of geothermal systems. In: Proc. World Geothermal Congress 2015, Melbourne, 7 pp.
5. An evaluation of plate tectonic models for the development of Sumatra;Barber;Gondwana Res.,2005