It was actually a German pilot who recommended it too me, then I ran across it at Foyle's, London.
Now, let me see, ISBN 0-304-35860-6.
"Full Circle"
It's old, but it has the basics pretty well sorted, and quite good coverage of WWI.
For a good selection, try
http://www.motorbooks.co.ukThey have something in excess of 6000 titles about aviation.
Worth a visit if you're there.
Foyle's also has some goodies, never get out of that store without a flight book in a bag,lol.
So, good luck.