To cite package ‘gsearly’ in publications use:

  Parsons N (2026). _gsearly: Creates Group Sequential Trial Designs
  when Early Outcomes are Available_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=gsearly>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gsearly: Creates Group Sequential Trial Designs when Early Outcomes are
Available},
    author = {Nick Parsons},
    year = {2026},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=gsearly},
  }