Can I put a external link in my book? Like if I want than when my user click in a part of my book, they could go to a specific external link.
Yes:
https://www.youtube.com/watch?v=ekpAGfmPI5k
http://3dflipbook.net/css-layer-highlight
Yes:
https://www.youtube.com/watch?v=ekpAGfmPI5k
http://3dflipbook.net/css-layer-highlight