To cite package ‘pensynth’ in publications use:

  van Kesteren E (2024). _pensynth: Penalized Synthetic Control
  Estimation_. R package version 0.6.0,
  <https://github.com/vankesteren/pensynth>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {pensynth: Penalized Synthetic Control Estimation},
    author = {Erik-Jan {van Kesteren}},
    year = {2024},
    note = {R package version 0.6.0},
    url = {https://github.com/vankesteren/pensynth},
  }