1. http://www.perspebsi.org/. History of Indonesian Society of Neurosurgery . 2009. Available from: http://www.perspebsi.org/index.php/public/about/information-history/.
3. Samuel H, Greenblatt. T. , Forcht-Dagi T, Mel HE. A History of Neurosurgery: In Its Scientific and Professional Contexts.Germany: Thieme Medical Publishers; 1997.
5. Central Intelligence Agency . The World Fact Book. East and Southeast Asia: Indonesia. 2014. Available from: https://www.cia.gov/library/publications/the-world-factbook/geos/id.html.