Hits 1-4 within 4 documents
Hits 1-4 within 4 documents
Editor(s): Zentralinstitut für Jugendforschung (ZIJ).- 1981. 35p.
Author(s): Künzi, Kilian; Fritschi, Tobias; Egger, Theres.- 2004. 233p.
Author(s): Spiegel, Jürgen.- 2008. 202p.
Author(s): Künzi, Kilian; Fritschi, Tobias; Oesch, Thomas; Gehrig, Matthias; Julien, Nora.- 2009. 111p.