@book{Gebhardt2017,
  author    = {Gebhardt, Dirk},
  title     = {Quer durch},
  publisher = {Nimbus},
  address   = {W{\"a}denswil},
  isbn      = {978-3-03850-034-6},
  pages     = {287},
  year      = {2017},
  language  = {de}
}
@book{GebhardtKoldehoffKoldehoff2013,
  author    = {Gebhardt, Dirk and Koldehoff, Nora and Koldehoff, Stefan},
  title     = {Unter freiem Himmel},
  publisher = {Nimbus},
  address   = {W{\"a}denswil},
  isbn      = {978 3 907142 90 5},
  pages     = {76},
  year      = {2013},
  language  = {de}
}