Kenneth Munson
German War Birds from World War 1 to NATO Ally
Bombers: patrol and reconnaissance aircraft 1914-1919, (The Pocket encyclopaedia of world aircraft in colour)
Bombers in service: patrol and transport aircraft since 1960, (The Pocket encyclopaedia of world aircraft in colour)
Pocket Encyclopaedia of World Aircraft: Bombers, 1939-45 (Colour)
Blandford Book of Warplanes