@incollection{HartoghWickel2004,
  author    = {Hartogh, Theo and Wickel, Hans Hermann},
  title     = {Biografiearbeit},
  series = {Th. Hartogh \& H. H. Wickel, Handbuch: Musik in der Sozialen Arbeit},
  booktitle = {Th. Hartogh \& H. H. Wickel, Handbuch: Musik in der Sozialen Arbeit},
  edition   = {1.},
  publisher = {Juventa},
  address   = {Weinheim},
  isbn      = {3-7799-0787-9},
  pages     = {223 -- 228},
  year      = {2004},
  language  = {de}
}
@article{WickelHartogh2005,
  author    = {Wickel, Hans Hermann and Hartogh, Theo},
  title     = {Ausbildungsdisziplin Musikgeragogik},
  series = {Musikforum},
  volume    = {3},
  journal   = {Musikforum},
  number    = {3},
  pages     = {16 -- 18},
  year      = {2005},
  language  = {mul}
}