Thanks for your queries. My book, Stalingrad: How the Red Army Triumphed (Pen and Sword Military, 2007) is out in the UK - and the best way to get it is on
www.amazon.co.uk Casemate are bringing it out in the USA later this summer.
The film Enemy at the Gates is nothing like the book - instead it focuses on the sniper duel between Zaitsev and a German opponent who is largely the invention of Soviet propaganda.
There is at last a lot of new material - both archival and veteran testimony - coming out about the battle in Russia, allowing us the chance to re-evaluate this famous clash of arms.
Best wishes, Mike.