To cite package ‘TFBSTools’ in publications use:

  Tan, G., and Lenhard, B. (2016). TFBSTools: an R/bioconductor package
  for transcription factor binding site analysis. Bioinformatics 32,
  1555-1556.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {TFBSTools: an R/Bioconductor package for transcription factor binding site analysis},
    author = {Ge Tan and Boris Lenhard},
    year = {2016},
    journal = {Bioinformatics},
    volume = {32},
    issue = {10},
    pages = {1555-1556},
    doi = {10.1093/bioinformatics/btw024},
    url = {http://bioinformatics.oxfordjournals.org/content/32/10/1555},
  }