To cite package ‘gradethis’ in publications use:

Aden-Buie G, Chen D, Grolemund G, Rossell Hayes A, Schloerke B (2023). gradethis: Automated Feedback for Student Exercises in 'learnr' Tutorials. R package version 0.2.14, https://github.com/rstudio/gradethis.

Corresponding BibTeX entry:

  @Manual{,
    title = {gradethis: Automated Feedback for Student Exercises in
      'learnr' Tutorials},
    author = {Garrick Aden-Buie and Daniel Chen and Garrett Grolemund
      and Alexander {Rossell Hayes} and Barret Schloerke},
    year = {2023},
    note = {R package version 0.2.14},
    url = {https://github.com/rstudio/gradethis},
  }