To cite scpi in publications use:

Cattaneo MD, Feng Y, Palomba F, Titiunik R (2025). “scpi: Uncertainty Quantification for Synthetic Control Methods.” Journal of Statistical Software, 113(1), 1–38. doi:10.18637/jss.v113.i01.

Corresponding BibTeX entry:

  @Article{,
    title = {{scpi}: Uncertainty Quantification for Synthetic Control
      Methods},
    author = {Matias D. Cattaneo and Yingjie Feng and Filippo Palomba
      and Roc{\'i}o Titiunik},
    journal = {Journal of Statistical Software},
    year = {2025},
    volume = {113},
    number = {1},
    pages = {1--38},
    doi = {10.18637/jss.v113.i01},
  }