To cite package ‘openrouteservice’ in publications use:

  Oleś AK (2024). _openrouteservice: An 'openrouteservice' API Client_.
  R package version 0.6.1,
  <https://github.com/giscience/openrouteservice-r>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {openrouteservice: An 'openrouteservice' API Client},
    author = {Andrzej K. Oleś},
    year = {2024},
    note = {R package version 0.6.1},
    url = {https://github.com/giscience/openrouteservice-r},
  }