Why do I have to buy the same book over and over for each device?
I bought a book for the iPad on the iTunes app, then when I wanted to read the same book on my iPhone, I had to purchase the same book again and then to read on my Mac at home I had to purchase the same book again. I thought once I purchased a book under my account that I could use it on all of my devices, but apparently not so. Is this how it is supposed to work? Having to purchase the same book for each device? If not, how does this work and how do I get a refund for the two book I've purchased extra?
MacBook Pro with Retina display, OS X El Capitan (10.11.3), 16G RAM