Are there also book on the Italian Royal family in EnglisH?
Italy and Its Monarchy - Dennis Mack Smith. This was a great book. I highly recommend it. (Easy to find)
Try these as well. The author is a very a interesting person. Upon his death he bequeathed half a billion and yes half a billion to NYU. He has quite a storied family back ground.
Bourbons of Naples (The) Harold Acton (Requires some work to find)
Last Bourbons of Naples (The) Harold Acton (Requires some work to find)
I also have that book Gdella identified House of Savoy by R. Katz, but I have yet to read it. I think I located another about Prince Eugen of Savoy, but I haven't read it either.
I haven't found too much more. If you do, please advise.