countryatlas is a join layer over other people's data. Citing the package alone under-credits the sources it reconciles, so please cite the package and whichever of the data sources your analysis actually used.

To cite the package:

Yu Y (2026). countryatlas: Join World Bank Data, Country Codes and Maps on the ISO Spine. R package version 3.0.0, https://pursuitofdatascience.github.io/countryatlas/.

Country-name reconciliation rests on countrycode:

Arel-Bundock V, Enevoldsen N, Yetman C (2018). “countrycode: An R package to convert country names and country codes.” Journal of Open Source Software, 3(28), 848. doi:10.21105/joss.00848.

Indicators fetched with world_data() / country_data() come from the World Bank:

World Bank (2024). World Development Indicators. The World Bank. https://datatopics.worldbank.org/world-development-indicators/.

The sf geometry backend uses Natural Earth (public domain):

Natural Earth (2024). Natural Earth: Free vector and raster map data. Natural Earth. https://www.naturalearthdata.com/.

The default projection is Equal Earth:

Savric B, Patterson T, Jenny B (2019). “The Equal Earth map projection.” International Journal of Geographical Information Science, 33(3), 454–465. doi:10.1080/13658816.2018.1504949.

The classification guidance in world_map() / classify_compare() follows:

Brewer C, Pickle L (2002). “Evaluation of methods for classifying epidemiological data on choropleth maps in series.” Annals of the Association of American Geographers, 92(4), 662–681. doi:10.1111/1467-8306.00310.

value_by_alpha_map() implements:

Roth R, Woodruff A, Johnson Z (2010). “Value-by-alpha maps: an alternative technique to the cartogram.” The Cartographic Journal, 47(2), 130–140. doi:10.1179/000870409X12488753453372.

morans_i() implements:

Moran P (1950). “Notes on continuous stochastic phenomena.” Biometrika, 37(1/2), 17–23. doi:10.2307/2332142.

Corresponding BibTeX entries:

  @Manual{,
    title = {{countryatlas}: Join World Bank Data, Country Codes and
      Maps on the ISO Spine},
    author = {Youzhi Yu},
    year = {2026},
    note = {R package version 3.0.0},
    url = {https://pursuitofdatascience.github.io/countryatlas/},
  }

  @Article{,
    title = {countrycode: An {R} package to convert country names and
      country codes},
    author = {Vincent Arel-Bundock and Nils Enevoldsen and CJ Yetman},
    journal = {Journal of Open Source Software},
    volume = {3},
    number = {28},
    pages = {848},
    year = {2018},
    doi = {10.21105/joss.00848},
  }

  @Manual{,
    title = {World Development Indicators},
    author = {{World Bank}},
    organization = {The World Bank},
    year = {2024},
    url =
      {https://datatopics.worldbank.org/world-development-indicators/},
  }

  @Manual{,
    title = {Natural Earth: Free vector and raster map data},
    author = {{Natural Earth}},
    organization = {Natural Earth},
    year = {2024},
    url = {https://www.naturalearthdata.com/},
  }

  @Article{,
    title = {The Equal Earth map projection},
    author = {Bojan Savric and Tom Patterson and Bernhard Jenny},
    journal = {International Journal of Geographical Information
      Science},
    volume = {33},
    number = {3},
    pages = {454--465},
    year = {2019},
    doi = {10.1080/13658816.2018.1504949},
  }

  @Article{,
    title = {Evaluation of methods for classifying epidemiological data
      on choropleth maps in series},
    author = {Cynthia A. Brewer and Linda Pickle},
    journal = {Annals of the Association of American Geographers},
    volume = {92},
    number = {4},
    pages = {662--681},
    year = {2002},
    doi = {10.1111/1467-8306.00310},
  }

  @Article{,
    title = {Value-by-alpha maps: an alternative technique to the
      cartogram},
    author = {Robert E. Roth and Andrew W. Woodruff and Zachary F.
      Johnson},
    journal = {The Cartographic Journal},
    volume = {47},
    number = {2},
    pages = {130--140},
    year = {2010},
    doi = {10.1179/000870409X12488753453372},
  }

  @Article{,
    title = {Notes on continuous stochastic phenomena},
    author = {P. A. P. Moran},
    journal = {Biometrika},
    volume = {37},
    number = {1/2},
    pages = {17--23},
    year = {1950},
    doi = {10.2307/2332142},
  }