Amazon | BMW Boxer Twins: All air-cooled R45, R50, R60, R65, R75, R80, R90, R100, RS, RT & LS (Not GS) models 1969 to 1994 (Essential Buyer's Guide) | Henshaw, Peter | History
BMW Motorrad Concept Roadster Features Powerful 2-Cylinder Boxer Engine - Tuvie Design
BMW-Motorräder mit Boxer-Motoren: alle Modelle 1969-1989 // Reprint der 2. Auflage 1994: Korp, Dieter, Mai, Hans-Joachim: 9783613011298: Amazon.com: Books