To cite package ‘NBDesign’ in publications use:

Luo X (2020). NBDesign: Design and Monitoring of Clinical Trials with Negative Binomial Endpoint. R package version 2.0.0, https://CRAN.R-project.org/package=NBDesign.

Corresponding BibTeX entry:

  @Manual{,
    title = {NBDesign: Design and Monitoring of Clinical Trials with
      Negative Binomial Endpoint},
    author = {Xiaodong Luo},
    year = {2020},
    note = {R package version 2.0.0},
    url = {https://CRAN.R-project.org/package=NBDesign},
  }