To cite package ‘GISTools’ in publications use:

  Brunsdon C, Lu B, Chen H (2024). _GISTools: Further Capabilities in
  Geographic Information Science_. R package version 1.0-2,
  <https://CRAN.R-project.org/package=GISTools>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {GISTools: Further Capabilities in Geographic Information Science},
    author = {Chris Brunsdon and Binbin Lu and Hongyan Chen},
    year = {2024},
    note = {R package version 1.0-2},
    url = {https://CRAN.R-project.org/package=GISTools},
  }