"Buxton's Guide to Foreign Firearms" tells you what Bernie models were available in the early 60's and how much they cost.

Michael McIntosh's "Gun Review Book" covers a lot of ground and contains a chapter on the Bernardelli Italia, one of their hammerguns. In the same book, in his "Best Buys" chapter, he discusses the Bernardelli Roma series.

As noted above, much of what you'll find on Bernardellis comes in bits and pieces, like what I've added here.