To cite package ‘polyclip’ in publications use:

  Johnson A, Baddeley A (2024). _polyclip: Polygon Clipping_. R package
  version 1.10-7, , <https://github.com/baddstats/polyclip>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {polyclip: Polygon Clipping},
    author = {Angus Johnson and Adrian Baddeley},
    year = {2024},
    note = {R package version 1.10-7, 
},
    url = {https://github.com/baddstats/polyclip},
  }