1. "Panzer" by Philip Warner (pretty general but it covers a wide variety of info.) 2 volumes
2. Russian AT weapons in earlier battles against PzKw 35(t) - 38(t), Pzkw III, etc have a better chance to knock out these lighter tanks. In later battles, through some frustrating experiences w/the game, Russian AT weapons (ATR's and Molotov Cocktails) are lucky to immobilize or shock armor. Sometimes though that is enough.