人口: The World Bank: World Development Indicators: World Bank Group • World Population Prospects, United Nations (UN), uri: https://population.un.org/wpp/, publisher: UN Population Division;
Statistical databases and publications from national statistical offices, National Statistical Offices, uri: https://unstats.un.org/home/nso_sites/, publisher: National Statistical Offices;
Eurostat: Demographic Statistics, Eurostat (ESTAT), uri: https://ec.europa.eu/eurostat/data/database?node_code=earn_ses_monthly, publisher: Eurostat;
Population and Vital Statistics Report (various years), United Nations (UN), uri: https://unstats.un.org, publisher: UN Statistics Division
都市人口: The World Bank: World Development Indicators: World Bank Group • World Urbanization Prospects, United Nations (UN), uri: https://population.un.org/wup/, publisher: UN Population Division
インターネット接続: The World Bank: World Development Indicators: World Bank Group • World Telecommunication/ICT Indicators Database, ITU (ITU), uri: https://datahub.itu.int/
携帯電話の利用: The World Bank: World Development Indicators: World Bank Group • World Telecommunication/ICT Indicators Database, ITU (ITU)