For the German reunification, I read a quite interesting essay by Vladimiro Giacché: "Anschluss. L'annessione. L'unificazione della Germania e il futuro dell'Europa" (also available in German).

A few potentially interesting links after a quick googling:

https://www.theguardian.com/world/2015/oct/02/german-reunifi...

http://fortune.com/2014/11/09/germany-east-west-economy/

http://www.economist.com/blogs/graphicdetail/2015/10/daily-c...

And for Italy:

http://www.citymetric.com/business/italys-north-south-divide...