http://fi.wikipedia.org/wiki/Basel
http://europeforvisitors.com/switzaustria/articles/basel.htm
http://wikitravel.org/en/Basel
http://www.swissworld.org/en/geography/towns/basel/
http://www.basel.com/fr.cfm/baselinfo/broschueren/offer-BaselInfoBT-Broschueren-244925.html
http://www.basel.ch/fr/kultur/museen.htm
http://www.linternaute.com/voyage/suisse/bale/
http://www.basel.com/fr.cfm/sightseeing/