To cite package ‘countryatlas’ in publications use:

  Yu Y (2026). _countryatlas: Join World Bank Data, Country Codes and
  Maps on the ISO Spine_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=countryatlas>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {countryatlas: Join World Bank Data, Country Codes and Maps on the ISO Spine},
    author = {Youzhi Yu},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=countryatlas},
  }