Hi,
if you are interested in Italian WW2 aviation, including both Regia Aeronautica and Aeronautica Nazionale Repubblicana, I suggest you this link: 150GCT
Of course most of the forum is in Italian language but if you have a question on above subjects, you can ask in English without any problem. There are many experts frequenting that forum, including one of authors of above book, plus other book writers and you can be sure that if they know the answer, they will quickly replay.
Alberto