so back on the topic, I absolutely reccomend "Tras la estela del Graf Spee" by Enrique Dick (editorial Edivern) . His dad was one of the German prisoners sent to Villa General Belgrano and it's a great first hand testimony. For the ship lovers it has some precise explanations on the technical details and for the history lovers... well, what can I say, amazing. Plus his dad's story before and after the war is just unbelievable.
Another interesting fact is that the author went on a diving expedition round the remains of the ship. There's a chapter about it in the 2009 edition