To cite the RankProd package in publications use:

  {Del Carratore}, F., Jankevics, A., Eisinga, R., Heskes, T., Hong, F.
  & Breitling, R. (2017). RankProd 2.0: a refactored Bioconductor
  package for detecting differentially expressed features in molecular
  profiling datasets. Bioinformatics. 33(17):2774-2775

A BibTeX entry for LaTeX users is

  @Article{,
    author = {{Del Carratore} and {F.} and {Jankevics} and {A.} and {Eisinga} and {R.} and {Heskes} and {T.} and {Hong} and {F.} and {Breitling} and {R.}},
    title = {RankProd 2.0: a refactored Bioconductor package for detecting differentially expressed features in molecular profiling datasets},
    journal = {Bioinformatics},
    year = {2017},
    volume = {33},
    issue = {17},
    pages = {2774-2775},
  }

  Hong, F., Breitling, R., McEntee, W.C., Wittner, B.S., Nemhauser,
  J.L., Chory, J. (2006). RankProd: a bioconductor package for
  detecting differentially expressed genes in meta-analysis
  Bioinformatics. 22(22):2825-2827

A BibTeX entry for LaTeX users is

  @Article{,
    author = {{Hong} and {F.} and {Breitling} and {R.} and {McEntee} and {W.C.} and {Wittner} and {B.S.} and {Nemhauser} and {J.L.} and {Chory} and {J.}},
    title = {RankProd: a bioconductor package for detecting differentially expressed genes in meta-analysis},
    journal = {Bioinformatics},
    year = {2006},
    volume = {22},
    pages = {2825-2827},
  }

See manpages and related packages for respective citations.