Where 2.0 2010: Dennis Crowley, “Adventures in Mobile Social 2.0: Twelve Months of foursquare”
Dennis Crowley (foursquare), “Adventures in Mobile Social 2.0: Twelve Months of foursquare”
Dennis Crowley (foursquare), “Adventures in Mobile Social 2.0: Twelve Months of foursquare”
Mark L. DeMulder (United States Geological Survey), “The Digital National Map of the United States of America”
Blaise Aguera y Arcas (Microsoft), “The Map as an Information Ecology”
OpenMobileMap | The Free Mobile Map Resources