How get a discount?

To get a discount price on the application version of the book, you need to have a paper version of the same edition.

If you want to buy the paper version, you have to go to the book page on the Antonio Delfino Editore online shop.
If you already own a book of the same edition, you have to use the discount coupon. If you need help about the discount coupon, use the related question on the page.