All AUDI A4 Models by Year (1994-Present) - Specs, Pictures & History - autoevolution
File:Audi A4 B9 Limousine 3.0 TDI quattro Heck.JPG - Wikimedia Commons
Audi A4 Sedan Generations: All Model Years
Audi A4: Most Up-to-Date Encyclopedia, News & Reviews
Audi A4 Sedan Generations: All Model Years
Audi A4: Most Up-to-Date Encyclopedia, News & Reviews
Audi A4 - Wikipedia
File:Audi S4 (B9) FL 1X7A0300.jpg - Wikimedia Commons
Delta Optimist December 5 2012 by Glacier Digital - Issuu
Audi A4 Sedan Generations: All Model Years
Audi A4 Sedan Generations: All Model Years