File:Audi A4 B6 Limo.jpg - Wikimedia Commons

File:Audi A6 C5 rear 20080222.jpg - Wikimedia Commons, audi a6 c5

Audi A3 on Audi-Fanatics - DeviantArt

Audi A3 on Audi-Fanatics - DeviantArt

Audi A6 - Wikiwand

Four Ring Cycle – Driven To Write

File:Audi A4 rear.JPG - Wikimedia Commons

Bosch (Robert Bosch GmbH) - MarkLines Automotive Industry Portal

Audi A4 B6 Saloon 2001 Feb to Dec 2004 Towbar - McCabe - The Towbar People

Audi A4, Autopedia

File:Audi A4 B8 Avant rear 20100725.jpg - Wikimedia Commons, audi a4 b8 avant

File:Audi A4 B6 (2000–2004) front MJ.JPG - Wikimedia Commons, audi a4 b6

File:Audi A4 B7 front 20080318 new.jpg - Wikimedia Commons, audi a4 b7

2001 Audi A6 4-Door Sedan Quattro AWD 6-spd Manual 2.7T

File:Audi A4 B6 front 20070326.jpg - Wikimedia Commons