To cite package ‘shadowpop’ in publications use:

  Barton F (2024). _shadowpop: Creates a "shadow population" for
  comparative data analysis_. R package version 0.0.1,
  <https://codeberg.org/francisbarton/shadowpop>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {shadowpop: Creates a "shadow population" for comparative data analysis},
    author = {Fran Barton},
    year = {2024},
    note = {R package version 0.0.1},
    url = {https://codeberg.org/francisbarton/shadowpop},
  }