To cite package ‘worldpa’ in publications use:

Casajus N (2021). worldpa: An Interface to the World Database on Protected Areas (WDPA). R package version 2.1.0, https://github.com/frbcesab/worldpa.

Corresponding BibTeX entry:

  @Manual{,
    title = {worldpa: An Interface to the World Database on Protected
      Areas (WDPA)},
    author = {Nicolas Casajus},
    year = {2021},
    note = {R package version 2.1.0},
    url = {https://github.com/frbcesab/worldpa},
  }