To cite package ‘choroplethrAdmin1’ in publications use:

Lamstein A (2018). choroplethrAdmin1: Contains an Administrative-Level-1 Map of the World. R package version 1.1.1, https://github.com/arilamstein/choroplethradmin1.

Corresponding BibTeX entry:

  @Manual{,
    title = {choroplethrAdmin1: Contains an Administrative-Level-1 Map
      of the World},
    author = {Ari Lamstein},
    year = {2018},
    note = {R package version 1.1.1},
    url = {https://github.com/arilamstein/choroplethradmin1},
  }