1
Published: Bonn, 1994.
Book
2
Published: Stuttgart : Enke, 1995.
Book
3
4
5
Published: Berlin : Ed. Sigma, 1994.
Book
6
7
8
9
Published: Bonn : Forschungsinst. der Friedrich-Ebert-Stiftung, Abt. Arbeits- und Sozialforschung, 1992.
Book