To cite REndo in publications use:

Gui R, Meierer M, Schilter P, Algesheimer R (2023). “REndo: Internal Instrumental Variables to Address Endogeneity.” Journal of Statistical Software, 107(3), 1–43. doi:10.18637/jss.v107.i03.

Corresponding BibTeX entry:

  @Article{,
    title = {{REndo}: Internal Instrumental Variables to Address
      Endogeneity},
    author = {Raluca Gui and Markus Meierer and Patrik Schilter and
      Ren\'e Algesheimer},
    journal = {Journal of Statistical Software},
    year = {2023},
    volume = {107},
    number = {3},
    pages = {1--43},
    doi = {10.18637/jss.v107.i03},
  }