Lui
Tomasoni
Mappa concettuale: http://maiello2.wdfiles.com/local--files/geo4/Mappa%20concettuale%20geografia.png?ukey=bea11f8f448e0f5b33644466d3210891a34dd19a
Terziario e commercio pag. 422 e 423
http://upload.wikimedia.org/wikipedia/commons/a/a2/Regional_Organizations_Map.png
http://dic.academic.ru/pictures/wiki/files/82/Regional_Organizations_Map.png
Unione europea= http://www.eastjournal.net/wp-content/uploads/2013/01/1000px-Energy_Community.svg_.png
Apec= http://cdn.blogosfere.it/lapulcedivoltaire/images/Apec_Countries.jpg
Mercosur= http://www.unc.edu/depts/diplomat/images/Newsmakers/maps/s_am_mercosur.gif
Nafta= https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQwP2BGwrEGjzS8FcnUUgsJiYf8XTVUd-pvr-uUCzDySYdqP3q2nX282jQb
Servizio dei trasporti= http://www.qualitytravel.it/wp-content/uploads/2014/03/treno-FS.jpg
Ricerca scientifica= http://3.bp.blogspot.com/-KmGG2PY0V6U/Tog2CQtNDDI/AAAAAAAAAAs/pqDv69a9gls/s1600/scoperta-scientifica-importante-2010.jpg