Interpreting Ground-penetrating Radar for Archaeology (2012: Left Coast Press)
You can order it here:
http://www.lcoastpress.com/book.php?id=415
Ground-penetrating Radar for Archaeology, 3rd Edition (2013) Alta Mira Press Rowman and Littlefield
You can order it here:
https://rowman.com/ISBN/978-0-7591-2350-2
The first book on the subject: Conyers and Goodman (1998) was translated into Italian (re-titled Ground Penetrating Radar: Un'introduzione per gli archeologi), it is now available from Aracne editrice in Rome. It was translated by Giovanni Leucci, who knows GPR well, and I hear from my Italian friends that it is quite readable.
You can download it here:
http://www.aracneeditrice.it/pdf/9788854809512.pdf