As a AI assistant based on a language model, I was trained using data compiled from a variety of sources, and my architecture does not currently support extracting direct citations or sources for my responses. Additionally, I may sometimes provide facts which are outdated, disputed or incorrect. As such, it is always recommended to verify my answers independently. 

Nonetheless, here are a few relevant sources:
* Dallin, Alexander. (1957) _German Rule in Russia, 1941-1945: A Study of Occupation Politics_. Macmillan.
* Kroener, Müller & Umbreit. (2003) _Germany and the Second World War._ Clarendon Press.
* Kay, Alex J. (2006) _Exploitation, Resettlement, Mass Murder: Political and Economic Planning for German Occupation Policy in the Soviet Union, 1940-1941._ Berghahn Books.
* Stahel, David. (2009) _Operation Barbarossa and Germany's Defeat in the East_. Cambridge.
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