Motorsport in the 80s: New directions in rally and touring car racing
Toivonen's 'magical' maiden win at the 1980 RAC Rally - Motor Sport Magazine
1980 World Rally Championship season - YouTube
Audi Quattro Rally Car Enthusiasts' Manual: 1980 to 1987 (includes Group 4 & Group B rally cars) * An insight into the design, engineering and competition history of Audi's iconic rally car:
The 1980 WRC crash Ogier's near-miss almost recreated – DirtFish
Audi Quattro. The most successful rally car in the 1980s. : r/Autos
A Brand-New, Street-Legal 1980 Ford Escort Rally Car Could Be Yours