Note that when I copy a URL from Firefox’s address bar, the brackets are automatically escaped (I can just paste the result); but when I right-click on a link and select “Copy Link Location”, the brackets aren’t escaped, and I get http://en.wikipedia.org/wiki/Mindset_(book).
You need to use escape characters instead of brackets, like this:
http://en.wikipedia.org/wiki/Mindset_%28book%29
Note that when I copy a URL from Firefox’s address bar, the brackets are automatically escaped (I can just paste the result); but when I right-click on a link and select “Copy Link Location”, the brackets aren’t escaped, and I get http://en.wikipedia.org/wiki/Mindset_(book).