Porto Turismo
Porto Turismo
http://www.portoturismo.pt/
O Porto
O Porto
http://members.ams.chello.nl/c.r.knobbe/
Elmar reisinformatie
Elmar reisinformatie
http://www.elmar.nl/informatie/podia/steden/porto/porto4642.asp
Portugal inSite
Portugal inSite
http://www.visitportugal.com/nr/exeres/99b17593-2fe4-488d-b77e-b15bd06a9596.htm
Portugal Travel Guide
Portugal Travel Guide
http://www.portugaltravelguide.com/en/porto.htm
Portugal Virtual
Portugal Virtual
http://www.portugalvirtual.pt/_tourism/costaverde/porto/nlindex.html