Three book I very much thouroughly enjoyed:
1) "Fighting in Hell" by Peter G Tsouras. This book is a recollection of four veteran accounts(German). Not so much a story of their battles but chapters divided into for example : German tactics, Air ops, clothing equipment and rations...etc Very interesting.
2) "Armageddon" by Max Hastings. Once again this book does not discuss so much Stalingrad as much as 1944-1945, the soviet/allied advance into Germany. A great read seeing as you are also able to see how the western front is going as well as the eastern.
3) "Panzer Operations". A Memoire by Erhard Raus, a very talented commander, and by the end of the war the foremost tactician of armoured warfare in the German army. His memories go from Barbarossa- Stalingrad- Kursk-Kharkov- Pomerania. Very good, nice maps, well written.
Anyways that's it Enjoy!