1. Sir Ashton Roskill, Monopolies Commission Report, Clutch Mechanisms for Road Vehicles (H.M.S.O., London, 1968 ).
2. ‘Engines and Transmissions’, Autocar, 27 Nov 1952.
3. ‘The Manumatic Control’, Automobile Engineer Feb 1953, p. 7o.
4. ‘International Motor Show’, The Engineer 14 Nov 1952, P. 657.
5. C. C. Chayne, ‘Automatic Transmissions in America’, Inst. of Mech. Eng. Auto. Div. Proc.1952–3, p. 9.