Swedish naming of aircraft Jackson, Robert, Men of Power: The Lives of Rolls-Royce Chief Test Pilots Harvey and Jim Heyworth, pp.  159 Flight International 30 December 1960, pp. 1017.
Jackson, Robert, Men of Power: The Lives of Rolls-Royce Chief Test Pilots Harvey and Jim Heyworth, s. 159.  Flight International 30 December 1960, pp. 1017.