To cite package ‘UnplanSimon’ in publications use:

  Liu Y, Pan H (2024). _UnplanSimon: Methods for Managing Enrollment
  Deviation in Simon's Two-Stage Design_. R package version 0.1.0,
  <https://CRAN.R-project.org/package=UnplanSimon>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {UnplanSimon: Methods for Managing Enrollment Deviation in Simon's Two-Stage
Design},
    author = {Yunhe Liu and Haitao Pan},
    year = {2024},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=UnplanSimon},
  }