Rather than put URLs in books, I think it's better to put URLs them alongside them. You can always make updates, and you can save the paper, ink and oil you would have spent printing and shipping a bibliography through the distribution channel.<p>Press Release: <a href="http://www.thinkcomputer.com/corporate/news/pressreleases.html?id=32" rel="nofollow">http://www.thinkcomputer.com/corporate/news/pressreleases.ht...</a><p>Example: <a href="http://www.thinkpress.com/authoritas/resources.html" rel="nofollow">http://www.thinkpress.com/authoritas/resources.html</a>