To cite package ‘HPZoneAPI’ in publications use:

  Dijkstra A (2026). _HPZoneAPI: 'HPZone' API Interface_. R package
  version 1.3.0, <https://github.com/ggdatascience/hpzoneapi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {HPZoneAPI: 'HPZone' API Interface},
    author = {Aart Dijkstra},
    year = {2026},
    note = {R package version 1.3.0},
    url = {https://github.com/ggdatascience/hpzoneapi},
  }