To cite package ‘CrispRVariants’ in publications use:

  Lindsay, Helen, et al. CrispRVariants charts the mutation spectrum of
  genome engineering experiments. Nature Biotechnology 34.7 (2016):
  701-702.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {CrispRVariants charts the mutation spectrum of genome engineering experiments},
    author = {Helen Lindsay and Alexa Burger and Berthin Biyong and Anastasia Felker and Christopher Hess and Jona Zaugg and Elena Chiavacci and Carolin Anders and Martin Jinek and Christian Mosimann and Mark D. Robinson},
    year = {2016},
    journal = {Nature Biotechnology},
    doi = {doi:10.1038/nbt.3628},
    volume = {34},
    pages = {701--702},
  }