- http://www.disclaimer.de/disclaimer.htm
- http://www.unep.org/tunza/tunzachildren/downloads/country-Classification.pdf
- https://esa.un.org/unpd/wpp/
- http://www.worldbank.org
- http://www.instatis.de/
- http://esa.un.org/unpd/wpp/
- http://databank.worldbank.org/data/home.aspx
- http://www.census.gov/population/international/data/idb/informationGateway.php
- http://ec.europa.eu/eurostat/web/population-demography-migration-projections/statistics-illustrated
- https://www.destatis.de/DE/ZahlenFakten/LaenderRegionen/Internationales/Land/Land.html
- https://www.cia.gov/library/publications/the-world-factbook/
- http://www.geohive.com/
- http://www.citypopulation.de/index_d.html
- http://www.populstat.info/
- http://www.lib.utexas.edu/maps/index.html
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