To cite package ‘powertools’ in publications use:

  Crespi C, Liu Z (2025). _powertools: Power and Sample Size Tools_. R
  package version 0.1.2,
  <https://github.com/powerandsamplesize/powertools>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {powertools: Power and Sample Size Tools},
    author = {Catherine M. Crespi and Zichen Liu},
    year = {2025},
    note = {R package version 0.1.2},
    url = {https://github.com/powerandsamplesize/powertools},
  }