R23 Literature
| R20, R23 1942 | Spare parts List, illustrated, German |
| R23 1939 | Owners Manual |
| R23 1938-41 | Technical Data |
| BMW Singles | The Classic Motorcycle 2000 |
| R20, R23 1942 | Spare parts List, illustrated, German |
| R23 1939 | Owners Manual |
| R23 1938-41 | Technical Data |
| BMW Singles | The Classic Motorcycle 2000 |