As far as a shop manual goes, you can order one all printed out from Centerline, IAP, etc. Or you can get a big collection tailored for your car including service manual, owners manual, part manuals, tech bulletins, etc. etc. etc. free in electronic form from the Alfa Romeo Owners Club - ask for the "all-in-one":
Alfa Romeo Owners Club USA - Manuals
I have both - sometimes it's nice to have the printed copy in from of me when I'm working on the car.