To cite package ‘slippymath’ in publications use:

  McBain M, Sumner M (2024). _slippymath: Slippy Map Tile Tools_. R
  package version 0.3.1, <https://github.com/milesmcbain/slippymath>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {slippymath: Slippy Map Tile Tools},
    author = {Miles McBain and Michael Sumner},
    year = {2024},
    note = {R package version 0.3.1},
    url = {https://github.com/milesmcbain/slippymath},
  }