Links.

Study book:
http://www.nederlandsalstweedetaal.nl/nt2artikel.asp?id=419

Practice:
http://www.jekanmewat.nl 
http://www.verbix.com/languages/dutch.shtml

Basic Civic Integration Examination Abroad information:
http://www.naarnederland.nl/en/category/homeen

Rotterdam Expat desk:
http://www.rotterdam.nl/expatdesk
 
Rotterdam info:
http://www.rotterdam.nl/home_english 

http://en.rotterdam.info/visitors/

http://en.wikipedia.org/wiki/Rotterdam 
http://nl.wikipedia.org/wiki/Rotterdam