To cite the underlying methodology, use:

  Hainmueller J, Mummolo J, Xu Y (2019). “How Much Should We Trust
  Estimates from Multiplicative Interaction Models? Simple Tools to
  Improve Empirical Practice.” _Political Analysis_, *27*(2), 163-192.
  doi:10.1017/pan.2018.46 <https://doi.org/10.1017/pan.2018.46>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {How Much Should We Trust Estimates from Multiplicative Interaction Models? Simple Tools to Improve Empirical Practice},
    author = {Jens Hainmueller and Jonathan Mummolo and Yiqing Xu},
    journal = {Political Analysis},
    year = {2019},
    volume = {27},
    number = {2},
    pages = {163-192},
    doi = {10.1017/pan.2018.46},
  }

To cite the R package, use:

  Hainmueller J, Mummolo J, Qin T, Liu J, Liu Z, Xu Y (2026).
  _interflex: Estimation, Diagnostics and Visualization of Conditional
  Marginal Effects_. R package version 1.4.0,
  <https://CRAN.R-project.org/package=interflex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {interflex: Estimation, Diagnostics and Visualization of Conditional Marginal Effects},
    author = {Jens Hainmueller and Jonathan Mummolo and Tianzhu Qin and Jiehan Liu and Ziyi Liu and Yiqing Xu},
    year = {2026},
    note = {R package version 1.4.0},
    url = {https://CRAN.R-project.org/package=interflex},
  }