To cite package ‘powertools’ in publications use:

  Crespi C, Liu Z (2024). _powertools: Power and Sample Size Tools_. R
  package version 0.1.2,
  <https://CRAN.R-project.org/package=powertools>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {powertools: Power and Sample Size Tools},
    author = {Catherine M. Crespi and Zichen Liu},
    year = {2024},
    note = {R package version 0.1.2},
    url = {https://CRAN.R-project.org/package=powertools},
  }