To cite package ‘swdpwr’ in publications use:

  Chen J, Zhou X, Li F, Spiegelman. D (2024). _swdpwr: Power
  Calculation for Stepped Wedge Cluster Randomized Trials_. R package
  version 1.11, <https://CRAN.R-project.org/package=swdpwr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {swdpwr: Power Calculation for Stepped Wedge Cluster Randomized Trials},
    author = {Jiachen Chen and Xin Zhou and Fan Li and Donna Spiegelman.},
    year = {2024},
    note = {R package version 1.11},
    url = {https://CRAN.R-project.org/package=swdpwr},
  }