To cite package ‘atSNP’ in publications use:

  Zuo, C., Shin, S., Keles, S. atSNP: transcription factor binding
  affinity testing for regulatory SNP detection Bioinformatics
  31(20):3353-3355 (2015)

A BibTeX entry for LaTeX users is

  @Article{,
    title = {atSNP: transcription factor binding affinity testing for regulatory SNP detection},
    author = {Chandler Zuo and Sunyoung Shin and Sunduz Keles},
    year = {2015},
    journal = {Bioinformatics},
    doi = {10.1093/bioinformatics/btv328},
    volume = {31},
    issue = {20},
    pages = {-2},
  }