The Book of the Pre-War Douglas - All Models (1929-1939)
L.K. Heathcote | angielski | miękka oprawa | 90 str. | 2013
The Book of the Post-War Douglas - All Models (1948-1957)
Douglas Ltd. | angielski | miękka oprawa | 138 str. | 2013
The Book of 1930's British Motorcycle Gearboxes and Clutches
angielski | miękka oprawa | 118 str. | 2018