@book{Weber1999,
  author    = {Weber, Max},
  title     = {Ausgew{\"a}hlte Schriften : Potsdamer Internet-Ausgabe (PIA)},
  editor    = {Flitner, Elisabeth},
  publisher = {Univ.},
  address   = {Potsdam},
  year      = {1999},
  language  = {de}
}