1
by Bortz, Jürgen, Döring, Nicola
Published 2006
Springer Berlin Heidelberg

2
by Bortz, Jürgen, Döring, Nicola
Published 2002
Springer Berlin Heidelberg

3
by Bortz, Jürgen, Döring, Nicola
Published 1995
Springer Berlin Heidelberg

4
by Döring, Nicola, Bortz, Jürgen
Published 2016
Springer Berlin Heidelberg