@book{Hawking1988,
  author    = {Hawking, Stephen W.},
  title     = {Eine kurze Geschichte der Zeit. Die Suche nach der Urkraft des Universums},
  year      = {1988}
}

@book{Orwell1957,
  author    = {Orwell, George},
  title     = {1984},
  address   = {Konstanz},
  publisher = {Diana-Verlag},
  year      = {1957}
}

@book{Frank1957,
  author    = {Frank, Anne},
  title     = {Das Tagebuch der Anne Frank},
  address   = {Frankfurt/Main},
  publisher = {Fischer},
  year      = {1957}
}