Hits 1-4 within 4 documents
Hits 1-4 within 4 documents
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1979. 12p.
Author(s): Voß, Peter; Heinicke, Hans.- 1977. 97p.
Author(s): Starke, Kurt; Hoffmann, Achim; Schauer, Heinz; Neise, Ulrich; Ulbrich, Hans-Joachim; Kasek, Leonhard.- 1977. 148p.
Author(s): Gerth, Werner; Niebling, Birgit.- 1975. 51p.