1
by Frey, Michael
Published 2009
Rainer Hampp Verlag

2
by Frey, Michael
Published 2010
Rainer Hampp Verlag

3
by Nickel, Hildegard-Maria, Hüning, Hasko, Frey, Michael
Published 2008
Nomos Verlagsgesellschaft mbH & Co. KG

4
by Hüning, Hasko, Nickel, Hildegard Maria, Frey, Michael, Grüner, Silke
Published 1998
VS Verlag für Sozialwissenschaften