Transfer books from iPhone to computer

Want to transfer eBooks from iPhone to computer, no matter they are purchased or non-purchased? Actually, it's easy to do that with the help of iOS Assistant tool.  First connect iPhone to pc via usb cable, start the iOS Assistant tool. A short time scanning later, all eBooks will be listed on program window. Then we can choose all ebooks or just what we want to transfer to pc easily. It's so easy and safe.