1
by Halfar, Bernd
Published 2012
Nomos Verlagsgesellschaft mbH & Co. KG

2
by Halfar, Bernd, Borger, Andrea, Schuck, Annette
Published 2007
Nomos Verlagsgesellschaft mbH & Co. KG

3
by Halfar, Bernd, Moos, Gabriele, Schellberg, Klaus
Published 2020
Nomos Verlagsgesellschaft mbH & Co. KG