now, you have two buying options:
1.- buy a prined edition of the book (60€) by clicking here
2.- buy a virtual (pdf) version of the book.
to buy the digital copy, you can buy it trhu paypal, either by completing (and sending) the following form, or by sending 10€ to mcarmona [at] gmail [dot] com.
with all the money collected from this sale, i'm planning to print (and sell) a real book.