To cite package ‘opencage’ in publications use:

  Possenriede D, Sadler J, Salmon M (2026). _opencage: Geocode with the
  OpenCage API_. R package version 0.3.0,
  <https://CRAN.R-project.org/package=opencage>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {opencage: Geocode with the OpenCage API},
    author = {Daniel Possenriede and Jesse Sadler and Maëlle Salmon},
    year = {2026},
    note = {R package version 0.3.0},
    url = {https://CRAN.R-project.org/package=opencage},
  }