Kavalerchik, Boris: The Tanks of Operation Barbarossa. Soviet versus German Armour on the Eastern Front
This was one of my most favorites books of 2018. It dives deep into the strengths and weaknesses of both German and Soviet tanks, especially on the later Kavalerchik addes a lot of meaningful context and information. Although, at some points I think he is too negative on some of the Soviet equipment, e.g., the brittleness of the 76mm shell in 1941 was not really an issue. Nevertheless, highly recommended.
Jentz, Thomas L.: Panzertruppen – The complete guide to the Creation & Combat Employment of Germany’s Tank Force – 1933-1942
Jentz provides major insights in the whole development, organization, tactics and many other aspects on the German Panzer Forces in World War 2 and before. It is full of hard data, like numbers and organizational charts.
Corum, James S.: The Roots of Blitzkrieg. Hans von Seeckt and German Military Reform
Everyone knows Heinz Guderian, Erich von Manstein and Erwin Rommel. Yet, the Seeckt by reorganizing the German Armed Forces into the Reichswehr(1919-1935) after First World War lay the foundations for the Wehrmacht(1935-1945) and its successes. This book covers the lessons learned from World War 1, the development of Panzer and Luftwaffe doctrine among various other aspects.
How Germany Cheated Versailles