I noticed in this article on how to make print style sheets, it shows how to make it so that links appear, witch is the oposit of what you want, but that might lead to you figure out how they did it and overwrite it.
"4. Display the URLs in the body content
[Thanks to David Walsh for this idea] Links in your content don't do any good on the printed page. It would be pretty cool if you could just tap the linked word with your finger and it would open the webpage on your computer, but thats something I haven't even seen in the movies yet. For now, we can just use CSS pseudo class ":after" to drop in the URL right next to the link, using the content attribute. IE doesn't support it, but c'est la vie."