To cite package ‘ggperiodic’ in publications use:

  Campitelli E (2026). _ggperiodic: Easy Plotting of Periodic Data with
  'ggplot2'_. R package version 1.0.4,
  <https://CRAN.R-project.org/package=ggperiodic>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ggperiodic: Easy Plotting of Periodic Data with 'ggplot2'},
    author = {Elio Campitelli},
    year = {2026},
    note = {R package version 1.0.4},
    url = {https://CRAN.R-project.org/package=ggperiodic},
  }