Dutch GP 1989, Assen, Jean Philippe Ruggia (FR), Yamaha 250 Stock Photo - Alamy
MotoGP: Silly season or stupid season? - Motor Sport Magazine
1989 Grand Prix motorcycle racing season - Wikipedia
Watch: A stark reminder of a mercifully long-gone era in MotoGP history
WGPBIKELEGENDS on Twitter: "1989 Yamaha YZR500 ridden by Hubert Rigal at World GP Bike Legends 2015, Jerez. Subscribe… http://t.co/YpvYqp8kax http://t.co/PY4KH8iqPo" / Twitter
MotoGP: Cal Crutchlow Rides 1989 NSR500 During Honda Racing Thanks Day At Motegi (Preview Video Included) - Roadracing World Magazine | Motorcycle Riding, Racing & Tech News
Honda NSR500 HB #3 Japan Moto GP 1989 - Racing Decals 43 | Car-model-kit.com
File:Hans Spaan 1989 Japanese GP.jpg - Wikimedia Commons
1989 Grand Prix motorcycle racing season - Wikipedia
Wayne Rainey (USA) Yamaha 500, Dutch moto GP 1989, Assen Stock Photo - Alamy
Australian MotoGP 1989 | With Phil Aynsley | MCNews
In memory of... MotoGP's craziest winter | MotoGP | Feature