To cite package ‘RTCGAToolbox’ in publications use:

  Samur MK. RTCGAToolbox: A new tool for exporting TCGA Firehose data.
  PLoS One. 2014 Sep 2;9(9):e106397. doi: 10.1371/journal.pone.0106397.
  eCollection 2014

A BibTeX entry for LaTeX users is

  @Article{,
    title = {RTCGAToolbox: a new tool for exporting TCGA Firehose data},
    author = {Mehmet Kemal Samur},
    journal = {PLoS One},
    year = {2014},
    volume = {9(9):e106397},
  }