To cite package ‘ptvalue’ in publications use:

  Gellen-Kamel A (2025). “ptchart: An R package for printing and
  manipulating Precision Teaching values.”

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {ptchart: An R package for printing and manipulating Precision Teaching values.},
    author = {Alexandre Gellen-Kamel},
    version = {0.2.0},
    year = {2025},
  }