To cite package ‘HCTDesign’ in publications use:

  Patni T, Li Y, Wu J (2025). _HCTDesign: Group Sequential Design for
  Historical Control Trial with Survival Outcome_. R package version
  0.7.4, <https://CRAN.R-project.org/package=HCTDesign>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {HCTDesign: Group Sequential Design for Historical Control Trial with
Survival Outcome},
    author = {Tushar Patni and Yimei Li and Jianrong Wu},
    year = {2025},
    note = {R package version 0.7.4},
    url = {https://CRAN.R-project.org/package=HCTDesign},
  }