LISTS OF MAJOR URBAN AREAS VARY SO GREATLY. RoyalDutchGeographicalSociety(英语:RoyalDutchGeographicalSociety): 34. 2009 [2014-03-20]. (原始内容存档于2014-01-22)
LISTS OF MAJOR URBAN AREAS VARY SO GREATLY. RoyalDutchGeographicalSociety(英语:RoyalDutchGeographicalSociety): 34. 2009 [2014-03-20]. (原始内容存档于2014-01-22)
LISTS OF MAJOR URBAN AREAS VARY SO GREATLY. RoyalDutchGeographicalSociety(英语:RoyalDutchGeographicalSociety): 34. 2009 [2014-03-20]. (原始内容存档于2014-01-22)