1. World Population Prospects: The 2015 Revision, Key Findings and Advance Tables,2015
2. The World Bank Indonesiahttp://data.worldbank.org/country/indonesia
3. Who Sage Survey Manual: The Who Study on Global Ageing and Adult Health (SAGE),2006
4. United Nations Statistics Division Indonesiahttp://data.un.org/CountryProfile.aspx?crName=indonesia#Summary