To cite package ‘undidR’ in publications use:

  Jamieson E (2025). _undidR: Difference-in-Differences with Unpoolable
  Data_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=undidR>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {undidR: Difference-in-Differences with Unpoolable Data},
    author = {Eric Jamieson},
    year = {2025},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=undidR},
  }