Read the owner's manual. If you do not have a copy, contact Beretta and get one. Link below is to their electronic copy, which discusses magazines.
Grips, magazines, sights.
Generally, yes
Supply and demand
for magazines try: edssportshop.com
Old gun catalogs and magazines.
Magazines available at ammoclip.com
brownells has magazines for around ten bucks
Gun shows, gun shops, want ads, e-gunparts.com
Atticus and Cal were going to Finch's Landing to tell Aunt Alexandra about Tom's death.
How do I open an Iver johnson 32 cal pistol?
L Blue Book of Gun Values, old gun magazines/catalogs
caliber marking