To cite package ‘ffm’ in publications use:

  Lieth J (2026). _ffm: Download Official Spatial Data from Germany_. R
  package version 0.1.2, <https://github.com/jslth/ffm>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ffm: Download Official Spatial Data from Germany},
    author = {Jonas Lieth},
    year = {2026},
    note = {R package version 0.1.2},
    url = {https://github.com/jslth/ffm},
  }