I recommend both "Stalingrad" and "The battle of Berlin 1945" by Anthony Beevor.

Also, "Stalingrad, the infernal surrounding" by Stephen Walsh is very nice and covers all the war since 1941 until 1943.

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"War is less costly than servitude, the choice is always between Verdun and Dachau." - Jean Dutourd, French veteran of both world wars

"A mon fils: depuis que tes yeux sont fermes les miens n’ont cessé de pleurir." - Mère française, Verdun