To cite package ‘PKNCA’ in publications use:

  Denney W, Duvvuri S, Buckeridge C (2015). “Simple, Automatic
  Noncompartmental Analysis: The PKNCA R Package.” _Journal of
  Pharmacokinetics and Pharmacodynamics_, *42*(1), 11-107,S65. ISSN
  1573-8744, doi:10.1007/s10928-015-9432-2
  <https://doi.org/10.1007/s10928-015-9432-2>, R package version
  0.11.0.9000, <https://github.com/billdenney/pknca>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Simple, Automatic Noncompartmental Analysis: The PKNCA R Package},
    author = {William S. Denney and Sridhar Duvvuri and Clare Buckeridge},
    doi = {10.1007/s10928-015-9432-2},
    journal = {Journal of Pharmacokinetics and Pharmacodynamics},
    pages = {11-107,S65},
    year = {2015},
    volume = {42},
    number = {1},
    issn = {1573-8744},
    url = {https://github.com/billdenney/pknca},
    note = {R package version 0.11.0.9000},
  }