To cite package 'RNASeqPower' in publications use:

  Terry Therneau, Steven Hart and Jean-Pierre Kocher (). Calculating
  samplesSize estimates for RNA Seq studies. R package version 1.45.0.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Calculating samplesSize estimates for RNA Seq studies},
    author = {Terry Therneau and Steven Hart and Jean-Pierre Kocher},
    note = {R package version 1.45.0},
  }