@book{Merchel2003,
  author    = {Joachim Merchel},
  title     = {Tr{\"a}gerstrukturen in der sozialen Arbeit},
  edition   = {1. Aufl.},
  series    = {Eine Einf{\"u}hrung},
  isbn      = {3-7799-0734-8},
  year      = {2003},
}