BattleFront Miniatures are quite a bit on Stalingrad scattered around their site, including:
Beevor, A. (1999). Stalingrad. Penguin.
Chuikov, V. I. (1963). The Beginning of the Road: The story for the Battle for Stalingrad. Macgibbon and Kee.
Chuikov was, of course, the Russian commander in Stalingrad. A great resource. Seems to be the main reference for other authors. Tows the party line a little too much, but what can you expect from a Marshal of the Soviet Union.
Clark, A. (1965). Barbarossa. Cassell.
Doerr, H. (1955). Der Feldzug nach Stalingrad. Darmstadt.
Major-General Hans Doerr was a German officer at Stalingrad. His book, translated as Campaign in Stalingrad, is cited by Chuikov (1963).
Erickson, J. (1993). The Road to Stalingrad: Stalin’s war with Germany: Volume One. London: Weidenfeld.
Very good. Very detailed. And provides a much better sequence of events than other sources.
Fowler, W. (2005). Stalingrad: The Vital 7 Days. Spellmount.
Information, Photos, and Original Maps of the Battle
Stalingrad: All you want to know about great Battle (sic) (English and German).
Many photos and various information on the battle.
many Pictures from the battle and the city
Photos from a day long multi-player game using IABSM.
Volgadmin: Mamayev Hill Museum (English, Russian, German)
Volgadmin: Stalingrad Battle (English, Russian, German)