To cite package ‘ggpp’ in publications use:

Aphalo P (2026). ggpp: Grammar Extensions to 'ggplot2'. R package version 0.6.0, https://github.com/aphalo/ggpp.

Corresponding BibTeX entry:

  @Manual{,
    title = {ggpp: Grammar Extensions to 'ggplot2'},
    author = {Pedro J. Aphalo},
    year = {2026},
    note = {R package version 0.6.0},
    url = {https://github.com/aphalo/ggpp},
  }