http://en.wikipedia.org/wiki/Buenos_Aires
http://www.sgsep.com.au/insights/urbecon/urban-management-challenges-facing-buenos-aires/
http://simple.wikipedia.org/wiki/List_of_countries_by_population_density
http://en.wikipedia.org/wiki/Landmarks_in_Buenos_Aires
http://obelisco.hostelsuites.com/
http://www.demographia.com/db-bamsatrend.htm
http://www.lonelyplanet.com/maps/south-america/argentina/buenos-aires/
http://www.ifsa-butler.org/buenos-aires-intermediate.html
http://www.sgsep.com.au/insights/urbecon/urban-management-challenges-facing-buenos-aires/
http://simple.wikipedia.org/wiki/List_of_countries_by_population_density
http://en.wikipedia.org/wiki/Landmarks_in_Buenos_Aires
http://obelisco.hostelsuites.com/
http://www.demographia.com/db-bamsatrend.htm
http://www.lonelyplanet.com/maps/south-america/argentina/buenos-aires/
http://www.ifsa-butler.org/buenos-aires-intermediate.html