To cite package ‘cartogram’ in publications use:

  Jeworutzki S (2025). _cartogram: Create Cartograms with R_. R package
  version 0.4.0, , <https://github.com/sjewo/cartogram>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {cartogram: Create Cartograms with R},
    author = {Sebastian Jeworutzki},
    year = {2025},
    note = {R package version 0.4.0, 
},
    url = {https://github.com/sjewo/cartogram},
  }