You can include the link in the text of your hub. I learned to do this by reading a great hub by Sinea Pies. It's called Readers -- How To Keep Them Longer. Here is the URL: http://hubpages.com/literature/Readers
I recommend reading Sinea's entire hub to learn lots of good information about hubbing better, but to learn how to make your link open into a new window, scroll down to the heading: Open In a New Window. Her directions will walk you through the process. It takes just a teeny bit of practice, but I always use it when I want to include a link to another site as a reference or more detailed information on my subject so that I don't lose my reader. Follow Sinea's directions and you'll be 'linking' through a new window like a pro in no time.
Feel free to contact me if you need more info or contact Sinea. I know she will be very helpful as she was to me.