@misc{Zimmermann_Klaus_F._Immigration_2007,
 author={Zimmermann, Klaus F.},
 howpublished={online},
 year={2007},
 contents={Berlin},
 publisher={Springer},
 title={Immigration policy and the labor market : the German experience and lesson for Europe},
 keywords={imigracja, przepływ siły roboczej, rynek pracy},
}