1
by Kinkel, Steffen, Friedewald, Michael, Hüsing, Bärbel, Lay, Gunter
Published 2008
Nomos Verlagsgesellschaft mbH & Co. KG

2
by Revermann, Christoph, Hüsing, Bärbel
Published 2011
Nomos Verlagsgesellschaft mbH & Co. KG