The Harleyford books on Sopwith (Sopwith - The Man and his Aircraft) and Fokker (Fokker - The Man and the Aircraft) have a fair amount of information.
There have been several additional bios on Fokker - Weyl (see
this thread before you read it, and Dierikx (Fokker - A Transatlantic Biography)
Also, Flying Dutchman is a Fokker bio at least partially written by him.
There's a bio of Bleriot out there as well but I don't know it (Elliot, B.A. Blériot: Herald of an Age).