To cite package ‘IsoFishR’ in publications use:

  Willmes M, Ransom KM, Lewis LS, Denney CT, Glessner JJG, Hobbs JA
  (2018). “IsoFishR: An application for reproducible data reduction and
  analysis of strontium isotope ratios (87Sr/86Sr) obtained via
  laser-ablation MC-ICP-MS.” _PLOS ONE_, *13*(9), e0204519.
  doi:10.1371/journal.pone.0204519
  <https://doi.org/10.1371/journal.pone.0204519>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {IsoFishR: An application for reproducible data reduction and analysis of strontium isotope ratios (87Sr/86Sr) obtained via laser-ablation MC-ICP-MS},
    author = {Malte Willmes and Katherine M. Ransom and Levi S. Lewis and Christian T. Denney and Justin J. G. Glessner and James A. Hobbs},
    journal = {PLOS ONE},
    year = {2018},
    volume = {13},
    number = {9},
    pages = {e0204519},
    doi = {10.1371/journal.pone.0204519},
  }