Not Barbarossa specific, but I'd say also check out Erich Hartmanns biography The Blond Knight of Germany.

Bf-109 pilot and highest scoring ace ever. Spent the majority of his time in WW2 in the eastern front. Very entertaining read and a hell of a life story. I just finished this morning Tigers in the Mud which is about a Tiger tank commander also on the eastern front and a fun read.

In my search for a good book on Barbarossa I ended up pivoting to reading memoirs from soldiers who fought in it. The Forgotten Soldier by Guy Sajer comes very highly recommended and is next on my list. I'll be reading that next.

"When Titans Clashed" has been in my list for a while but I think I'm finally going to pull the trigger on it.