To cite package ‘usa’ in publications use:

Nicholls K (2026). usa: Updated US State Facts and Figures. R package version 1.0.0.9000, https://github.com/k5cents/usa.

Corresponding BibTeX entry:

  @Manual{,
    title = {usa: Updated US State Facts and Figures},
    author = {Kiernan Nicholls},
    year = {2026},
    note = {R package version 1.0.0.9000},
    url = {https://github.com/k5cents/usa},
  }