To cite package ‘CTTvis’ in publications use:

  Wongvorachan T (2024). _CTTvis: Visualize Item Metrics of the
  Classical Test Theory Framework_. R package version 0.1.0,
  <https://github.com/taridwong/cttvis>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {CTTvis: Visualize Item Metrics of the Classical Test Theory Framework},
    author = {Tarid Wongvorachan},
    year = {2024},
    note = {R package version 0.1.0},
    url = {https://github.com/taridwong/cttvis},
  }