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>.

A BibTeX entry for LaTeX users is

  @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},
  }