@book{Koehler2011,
  author    = {Dennis K{\"o}hler},
  title     = {Bochumgerthe},
  publisher = {Druckverlag Kettler},
  address   = {B{\"o}nen},
  isbn      = {978-3-00-036860-8},
  pages     = {63},
  year      = {2011},
  language  = {de}
}