2
   
3
Published: Hamburg, Persen Verlag, [2013]
   
5
   
9
Published: Hamburg, Plan International Deutschland, 2015
   
11
Published: Hamburg, Behörde für Schule und Berufsbildung, 2011
   
13
   
19
Published: Münster, Waxmann, 2012
   
20
   

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