To cite nsink in publications use:

Hollister et al., (2022). nsink: An R package for flow path nitrogen removal estimation. Journal of Open Source Software, 7(71), 4039, https://doi.org/10.21105/joss.04039

Corresponding BibTeX entry:

  @Article{,
    title = {nsink: An R package for flow path nitrogen removal
      estimation},
    author = {Jeffrey W. Hollister and Dorothy Q. Kellogg and Qian
      Lei-Parent and Emily Wilson and Cary Chadwick and David Dickson
      and Arthur Gold and Chester Arnold},
    journal = {Journal of Open Source Software},
    year = {2022},
    volume = {7},
    number = {71},
    pages = {4039},
    url = {https://doi.org/10.21105/joss.04039},
    doi = {10.21105/joss.04039},
  }