We had given serious thought of staying at an agriturismo and to that end
did some research a couple of years ago. I found two books: Guida dell'
Ospitalita' Rurale published by Agriturist, Corso Emanuele, 101, Roma; and,
Turismo Verde published by Mondadori (http://www.mondadori.com/libri). Both books
have small pictures of all the agriturismo places with good description of
amenities. These are listed by Region. The former has price ranges and
recommendation by Agriturist. These guides are in Italian but not difficult
to use by the non literate person in Italian.
I am prudentially certain that the Tourist Club Italiano on Via del Babuino in Rome has these books. Too, I am sure that these could be ordered from a bookstore in Italy over the internet. Peter