To cite package ‘whatthreewords’ in publications use:

Smith D (2023). whatthreewords: Work with the 'what3words' API for Easy Location Referencing. R package version 0.1.3, https://github.com/davidasmith/whatthreewords.

Corresponding BibTeX entry:

  @Manual{,
    title = {whatthreewords: Work with the 'what3words' API for Easy
      Location Referencing},
    author = {David Smith},
    year = {2023},
    note = {R package version 0.1.3},
    url = {https://github.com/davidasmith/whatthreewords},
  }