To cite package ‘h3o’ in publications use:

  Parry J (2026). _h3o: H3 Geospatial Indexing System_. R package
  version 0.3.1, <https://github.com/extendr/h3o>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {h3o: H3 Geospatial Indexing System},
    author = {Josiah Parry},
    year = {2026},
    note = {R package version 0.3.1},
    url = {https://github.com/extendr/h3o},
  }