To cite package ‘IIS’ in publications use:

  Schneider G (2025). _IIS: Datasets to Accompany Wolfe and Schneider -
  Intuitive Introductory Statistics_. R package version 1.1,
  <https://CRAN.R-project.org/package=IIS>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {IIS: Datasets to Accompany Wolfe and Schneider - Intuitive
Introductory Statistics},
    author = {Grant Schneider},
    year = {2025},
    note = {R package version 1.1},
    url = {https://CRAN.R-project.org/package=IIS},
  }