How buy the paper edition of the book?
To buy a paper version of the book, you need to go to the book page on the Antonio Delfino online store.
If you want to buy both the paper and the application versions, you should start by buying the paper one.
A coupon in the book will give you access to the application purchase at a discounted price.
To discover how to use the discount coupon, click on the related question in this help.