To cite package ‘necountries’ in publications use:

  Croissant Y (2024). _necountries: Countries of the World_. R package
  version 0.1-2, <https://github.com/ycroissant/necountries>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {necountries: Countries of the World},
    author = {Yves Croissant},
    year = {2024},
    note = {R package version 0.1-2},
    url = {https://github.com/ycroissant/necountries},
  }