To cite package ‘clipper’ in publications use:

  Padgham M (2024). _clipper: Another Port of Angus Johnson's 'clipper'
  Polygon Clipping Library_. R package version 0.0.0.1,
  <https://github.com/hypertidy/clipper>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {clipper: Another Port of Angus Johnson's 'clipper' Polygon Clipping
Library},
    author = {Mark Padgham},
    year = {2024},
    note = {R package version 0.0.0.1},
    url = {https://github.com/hypertidy/clipper},
  }