What's more reliable

Which one would you rather use, the Internet or a book source. I know that more people are using the Internet more in today's world, but why isn't that some people say that the Internet is better to use more than a book source, or magazine, etc.. I think they are even, even though I use the Internet more often, some of the sites, anyone can change it, but the book can't change unless it's someone write an edited version of it. I think both of these sources a great to use when doing some research on a particular topic.