@book{OPUS4-11069,
  title     = {Handbuch Musik in der Sozialen Arbeit},
  editor    = {Hartogh, Theo and Wickel, Hans Hermann},
  publisher = {Beltz Juventa},
  address   = {Weinheim/Basel},
  isbn      = {978-3-7799-3136-2},
  publisher      = {FH M{\"u}nster - University of Applied Sciences},
  pages     = {474},
  year      = {2019},
  language  = {de}
}
@misc{OPUS4-14524,
  title     = {Policy guidelines of situational prevention measures in internet related disorders: Results of a German expert group commissioned by the Federal Ministry of Health. 4th International Conference on Behavioral Addictions, Haifa, Israel: 20.02.2017},
  year      = {2017},
  language  = {en}
}