Thank you for getting the book! And yeah Pinterest is really bad for artists, we don't post there, and so all the art you see is posted by other people who don't include links. It's better to look for artists on social media since we each follow several hundred other artists and will boost their posts. Alternatively you can right-click an image and select to search google for the image and it will find other sources (at least in Google Chrome).
Oh don't feel that way, a lot of people seem to miss it so I get this question a lot.
I hope you enjoy it!