To cite package ‘popstudy’ in publications use:

  Gamboa-Sanabria C (2025). _popstudy: Applied Techniques to
  Demographic and Time Series Analysis_. R package version 1.0.2,
  <https://github.com/cgamboasanabria/popstudy>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {popstudy: Applied Techniques to Demographic and Time Series Analysis},
    author = {Cesar Gamboa-Sanabria},
    year = {2025},
    note = {R package version 1.0.2},
    url = {https://github.com/cgamboasanabria/popstudy},
  }