To cite package ‘landr’ in publications use:

Provoost P (2023). landr: Add land polygons to ggplot2 maps. R package version 0.0.2, https://github.com/pieterprovoost/landr.

Corresponding BibTeX entry:

  @Manual{,
    title = {landr: Add land polygons to ggplot2 maps},
    author = {Pieter Provoost},
    year = {2023},
    note = {R package version 0.0.2},
    url = {https://github.com/pieterprovoost/landr},
  }