@misc{Mueller2019,
  author    = {M{\"u}ller, Hans-Georg},
  title     = {Rechtschreibung},
  publisher = {Senatsverwaltung f{\"u}r Bildung, Jugend und Familie},
  address   = {Berlin},
  pages     = {18},
  year      = {2019},
  language  = {de}
}