Please cite different statistical methods as indicated in the vignette.

  Rahmatallah Y and Zybailov B and Emmert-Streib F and Glazko G (2017).
  GSAR: Bioconductor package for gene set analysis in R. BMC
  Bioinformatics 18, 61

A BibTeX entry for LaTeX users is

  @Article{,
    title = {GSAR: Bioconductor package for gene set analysis in R},
    author = {Yasir Rahmatallah and Boris Zybailov and Frank Emmert-Streib and Galina Glazko},
    journal = {BMC Bioinformatics},
    volume = {18},
    pages = {61},
    year = {2017},
  }