To cite karel in publications use:

Prunello M (2024). karel: Learning programming with Karel the robot. R package version 0.1.1.9000, <https://mpru.github.io/karel/>.

Corresponding BibTeX entry:

  @Misc{karelpackage,
    title = {karel: Learning programming with Karel the robot},
    author = {Marcos Prunello},
    year = {2024},
    url = {https://mpru.github.io/karel/},
  }