To cite package ‘c403’ in publications use:

  Zeileis A, Umlauf N, Stauffer R (2024). _c403: Exam Tools for
  Department of Statistics (c403), Uni Innsbruck_. R package version
  0.9-3, <https://r-forge.r-project.org/projects/exams>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {c403: Exam Tools for Department of Statistics (c403), Uni Innsbruck},
    author = {Achim Zeileis and Nikolaus Umlauf and Reto Stauffer},
    year = {2024},
    note = {R package version 0.9-3},
    url = {https://r-forge.r-project.org/projects/exams},
  }