To cite package ‘ssutil’ in publications use:

  Aponte J (2025). _ssutil: Sample Size Calculation Tools_. R package
  version 1.0.0, <https://github.com/johnaponte/ssutil>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ssutil: Sample Size Calculation Tools},
    author = {John J. Aponte},
    year = {2025},
    note = {R package version 1.0.0},
    url = {https://github.com/johnaponte/ssutil},
  }