To cite package ‘ivreg’ in publications use:

Fox J, Kleiber C, Zeileis A (2026). ivreg: Instrumental-Variables Regression by '2SLS', '2SM', or '2SMM', with Diagnostics. R package version 0.6-7, https://github.com/zeileis/ivreg.

Corresponding BibTeX entry:

  @Manual{,
    title = {ivreg: Instrumental-Variables Regression by '2SLS', '2SM',
      or '2SMM', with Diagnostics},
    author = {John Fox and Christian Kleiber and Achim Zeileis},
    year = {2026},
    note = {R package version 0.6-7},
    url = {https://github.com/zeileis/ivreg},
  }