Without disagreeing in any way with previous choices I’ve found Alfred Price’s [I]The Spitfire Story [I] to be very useful as well. As far as the Hurricane is concerned some sections of Sydney Camm and the Hurricane by Dr. John Fozzard has been helpful too. But I do agree that the Hurricane deserves a very thorough consideration that will also include analysis of the Hawker company records about the reasons for some of the original design decisions.
Example; the Lewis gun installations on the fuselage / cockpit side shown on the original mock up in the Kingston works? How about a photograph and more detail of the DB 601 engined example built in Yugoslavia or didn’t it really exist?