Audi S4 Owner's Resource
- A collection of useful links, articles, and timeslips for the Audi S4 Biturbo enthusiast.
- http://www.s4biturbo.com

Cars.com: 2001 Audi S4
- Cars.com reprints a review of the 2001 Audi S4, that was written by Tom Incantalupo of 'Newsday.'
- http://www.cars.com/carsapp/national/?srv=review&act=search&mkid=4&mdid=28&yr=2001&x=19&y=19