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intgovforum.org
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web.archive.org
United Nations, "Population density and urbanization"; compare Werner Staub and Dirk Krischenowki. "GeoTLDs – Diversity, Multilingualism and Local Content,"Archived 2012-02-26 at the Wayback MachineInternet Governance Forum, Oct 30 – Nov 2, 2006, p. 31 n4; excerpt, "The United Nations has set up its own classifications scheme: a "big city" is a locality with 500,000 or more inhabitants; a "city" is a locality with 100,000 or more inhabitants; an "urban locality" is a locality with 20,000 or more inhabitants; a "rural locality" is a locality with less than 20,000 inhabitants ..."; retrieved 2013-4-24
wiktionary.org
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United Nations, "Population density and urbanization"; compare Werner Staub and Dirk Krischenowki. "GeoTLDs – Diversity, Multilingualism and Local Content,"Archived 2012-02-26 at the Wayback MachineInternet Governance Forum, Oct 30 – Nov 2, 2006, p. 31 n4; excerpt, "The United Nations has set up its own classifications scheme: a "big city" is a locality with 500,000 or more inhabitants; a "city" is a locality with 100,000 or more inhabitants; an "urban locality" is a locality with 20,000 or more inhabitants; a "rural locality" is a locality with less than 20,000 inhabitants ..."; retrieved 2013-4-24