To cite 'modelbased' in publications use:

Makowski D, Ben-Shachar M, Lüdecke D (2020). “Estimation of Model-Based Predictions, Contrasts and Means.” CRAN. https://github.com/easystats/modelbased.

Corresponding BibTeX entry:

  @Article{,
    title = {Estimation of Model-Based Predictions, Contrasts and
      Means.},
    author = {Dominique Makowski and Mattan S. Ben-Shachar and Daniel
      Lüdecke},
    journal = {CRAN},
    year = {2020},
    url = {https://github.com/easystats/modelbased},
  }