@book{Ryba2018,
  author    = {Michael Ryba},
  title     = {SeniorenCampus 1},
  publisher = {Lit Verlag},
  address   = {M{\"u}nster},
  isbn      = {978-3-643-13982-5},
  pages     = {149},
  year      = {2018},
  language  = {de}
}