To cite package ‘rnaturalearth’ in publications use:

  Massicotte P, South A (2024). _rnaturalearth: World Map Data from
  Natural Earth_. R package version 1.0.1.9000, ,
  <https://github.com/ropensci/rnaturalearth>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rnaturalearth: World Map Data from Natural Earth},
    author = {Philippe Massicotte and Andy South},
    year = {2024},
    note = {R package version 1.0.1.9000, 
},
    url = {https://github.com/ropensci/rnaturalearth},
  }