The R-Series Pedigree: YZF-R1 Model Evolution - Motorcycle | Yamaha Motor Co., Ltd.
FIM Racing Documents Point To Incoming Changes For Yamaha YZF-R1
How Yamaha's Iconic YZF-R1 Changed the Superbike Game for Good – Robb Report
File:Yamaha YZF-R1 at the Tokyo Motor Show 2009-1 neutral background.jpg - Wikimedia Commons
Yamaha Motor to Release Two New YZF-R1 Supersport Models in Europe and U.S. ~YZF-R1 & YZF-R1M share lineage with MotoGP machines | Yamaha Motor Co., Ltd.
C! Magazine | Yamaha Motor reveals 2020 R1, R1M sportbike in US