To cite package ‘valh’ in publications use:

  Giraud T, Viry M (2026). _valh: Interface Between R and the
  OpenStreetMap-Based Routing Service 'Valhalla'_. R package version
  0.2.0, <https://github.com/riatelab/valh>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {valh: Interface Between R and the OpenStreetMap-Based Routing Service
'Valhalla'},
    author = {Timothée Giraud and Matthieu Viry},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://github.com/riatelab/valh},
  }