To cite package 'RSA' in publications use:

Schönbrodt F, Humberg S (2025). RSA: An R package for response surface analysis (version 0.10.8). https://cran.r-project.org/package=RSA.

Corresponding BibTeX entry:

  @Manual{,
    title = {{RSA}: An R package for response surface analysis (version
      0.10.8)},
    author = {Felix Schönbrodt and Sarah Humberg},
    year = {2025},
    url = {https://cran.r-project.org/package=RSA},
  }