To cite the RTopper package in publications use:

  Integrating diverse genomic data using gene sets Svitlana Tyekucheva,
  Luigi Marchionni, Rachel Karchin, and Giovanni Parmigiani In Press,
  Genome Biology, 2011

A BibTeX entry for LaTeX users is

  @Article{,
    year = {2011},
    author = {Svitlana Tyekucheva and Luigi Marchionni and Rachel Karchin and Giovanni Parmigiani},
    title = {Integrating diverse genomic data using gene sets},
    journal = {Genome Biology},
    volume = {In Press},
  }