Good, neutral source for ISBN linking? (on citing books) In my bibliography, I want to link the ISBN number to an actual website. My question is: which website is recommended to be used? Is there some 'neutral' source that I can expect to be still functioning in 5 years and that will return reliable results? 

IBSN numbers are apparently provided by the International ISBN Agency, so this would clearly be the best source. Turns out, however, that they do not offer an ISBN lookup! I am currently considering two options:

Google Books: http://www.google.comco.uk/search?tbo=p&amp;tbm=bks&amp;q=isbn:0060930314&amp;num=10

ISBNSearch.org: http://www.isbnsearch.org/isbn/0060930314

Both appear to have their commercial interest, but they appear to be reliable enough. I would prefer Google. Or is there any other more recommended website?
You could use worldcat.org, it is built and maintained collectively by the participating libraries around the world (see Wikipedia article). 
They offer ISBN search, e.g. www.worldcat.org/search?q=isbn:0060930314