To cite package ‘npiv’ in publications use:

Racine J, Christensen T (2025). npiv: Nonparametric Instrumental Variables Estimation and Inference. R package version 0.1.3, https://CRAN.R-project.org/package=npiv.

Corresponding BibTeX entry:

  @Manual{,
    title = {npiv: Nonparametric Instrumental Variables Estimation and
      Inference},
    author = {Jeffrey S. Racine and Timothy Christensen},
    year = {2025},
    note = {R package version 0.1.3},
    url = {https://CRAN.R-project.org/package=npiv},
  }