That "Blonde Knight of Germany" is a horrible Cold War abonimation aimed mainly at the US population of the 60s and 70s to show just how bad the big bad Russkies are and how gallant their german opponents were. You can read it, but you need to be aware of this Cold War background and underlying intention all the time.
I don't think there is another bio of Hartmann ATM and most of the older literature on the Luftwaffe is pretty much the same as above. Here in Germany we call that the "justification books". There are a few modern bios on Luftwaffe pilots, most notably Christer Bergström's "Graf & Grislawski" which is bounds and leaps above those "ancient" tomes.
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