To cite package ‘isocountry’ in publications use:

  Mücke M (2024). _isocountry: ISO 3166-1 Country Codes_. R package
  version 0.3.0, <https://CRAN.R-project.org/package=isocountry>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {isocountry: ISO 3166-1 Country Codes},
    author = {Maximilian Mücke},
    year = {2024},
    note = {R package version 0.3.0},
    url = {https://CRAN.R-project.org/package=isocountry},
  }