To cite package ‘graticule’ in publications use:

Sumner M (2026). graticule: Meridional and Parallel Lines for Maps. R package version 0.4.0, https://github.com/hypertidy/graticule.

Corresponding BibTeX entry:

  @Manual{,
    title = {graticule: Meridional and Parallel Lines for Maps},
    author = {Michael D. Sumner},
    year = {2026},
    note = {R package version 0.4.0},
    url = {https://github.com/hypertidy/graticule},
  }