To cite package ‘revgeo’ in publications use:

  Hudecheck M (2017). _revgeo: Reverse Geocoding with the Photon
  Geocoder for OpenStreetMap, Google Maps, and Bing_. R package version
  0.15, <https://github.com/cranhaven/cranhaven.r-universe.dev>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {revgeo: Reverse Geocoding with the Photon Geocoder for OpenStreetMap,
Google Maps, and Bing},
    author = {Michael Hudecheck},
    year = {2017},
    note = {R package version 0.15},
    url = {https://github.com/cranhaven/cranhaven.r-universe.dev},
  }