To cite package ‘CGEN’ in publications use:

  Bhattacharjee S, Chatterjee N, Han S, Song M, Wheeler W, de
  Rochemonteix M, Sanyal N (2012). _CGEN: An R package for analysis of
  case-control studies in genetic epidemiology_. R package version
  3.41.0, <https://bioconductor.org/packages/CGEN>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {CGEN: An R package for analysis of case-control studies in genetic
epidemiology},
    author = {Samsiddhi Bhattacharjee and Nilanjan Chatterjee and Summer Han and Minsun Song and William Wheeler and Matthieu {de Rochemonteix} and Nilotpal Sanyal},
    year = {2012},
    note = {R package version 3.41.0},
    url = {https://bioconductor.org/packages/CGEN},
  }