Scooter literature

Amazon.com is a great website. Just as addictive as Ebay. After 5 minutes of browsing I ended up with the following scooter literature:

• The Lambretta bible: All Italian models covered
• Vespa 1946-2006: 60 years of Vespa. All Italian models covered, per decade. 
• Classic Scooters. Rare and odd scooter models you didn't know existed.
• Vespa: An Illustrated history. English produced Vespas.

The first two books are a "must have", but I can recommend the bottom two as well.