Lightroom 5 Book Module?

Greetings,

I started using Lightroom 3 a few years ago and eventually upgraded to Lightroom 5.  It's been working great of me.  Recently I decided to try making a photo book of some of my pictures.  I read that you can make a book from Lightroom and upload it to blurb, however, my version of Lightroom doesn't have the Book module selection at the top of my screen.  Is there something I can do to activate this feature?

Thanks,

Rick