https://www.helion.co.uk/military-history-books/imperial-german-army-motorised-troops-1914-18-volume-1-origins-organization-and-mechanical-innovation-in-the-great-war.php

https://www.helion.co.uk/military-history-books/imperial-german-army-motorised-troops-1914-18-volume-2-armoured-units-assault-tanks-and-the-weapons-of-modern-warfare.php