To cite HTSSIP in publications use:

Youngblut ND, Barnett SE, Buckley DH (2018) HTSSIP: An R package for analysis of high throughput sequencing data from nucleic acid stable isotope probing (SIP) experiments. PLoS ONE 13(1): e0189616.<doi:10.1371/journal.pone.0189616>

Corresponding BibTeX entry:

  @Article{,
    title = {HTSSIP: An R package for analysis of high throughput
      sequencing data from nucleic acid stable isotope probing (SIP)
      experiments},
    author = {Nicholas D. Youngblut and Samuel E. Barnett and Daniel H.
      Buckley},
    journal = {PLoS ONE},
    year = {2018},
    volume = {13},
    number = {1},
    pages = {e0189616},
    url =
      {http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0189616},
  }