To cite package ‘rksfun’ in publications use:

  Stöckl R (2025). _rksfun: rksfun - a collection of usefull (to me)
  code_. R package version 0.0.0.9000,
  <https://github.com/richardstoeckl/rksfun>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rksfun: rksfun - a collection of usefull (to me) code},
    author = {Richard Stöckl},
    year = {2025},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/richardstoeckl/rksfun},
  }