NationMaster's database seems to be compiled from a range of sources such as Wikipedia, national censuses, publications of the UNESCO Institute of Statistics, World Bank Development Indicators, the World Resources Institute, the World Health Organization and OECD reports.
NationMaster's database is compiled from a wide range of sources including Wikipedia, national censuses, publications of the UNESCO Institute of Statistics, and World Bank Development Indicators. A complete list of sources would also have to include as major contributors the World Resources Institute, the World Health Organization and OECD reports.