To cite package ‘etsi’ in publications use:

  Knowlton R, Parast L (2025). _etsi: Efficient Testing Using Surrogate
  Information_. R package version 1.0,
  <https://CRAN.R-project.org/package=etsi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {etsi: Efficient Testing Using Surrogate Information},
    author = {Rebecca Knowlton and Layla Parast},
    year = {2025},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=etsi},
  }