00410nam a2200145Ia 450000100060000000800410000602000180004704000130006508200160007810000190009424500790011326000540019230000110024654600070025716719140404s9999    xx            000 0 und d  a0-521-43017-8  cPK-LaUMT  a 307bWEN-C  aEtienne Wenger  aCommunities of practice:bLearning, meaning, and identity.cEtienne Wenger  aCambridge,USA:bCambridge University Press,c1999  a318 p.  aEN