To cite package ‘MPN’ in publications use:

  Ferguson M, Ihrie J (2026). _MPN: Most Probable Number and Other
  Microbial Enumeration Techniques_. R package version 0.5.0,
  <https://CRAN.R-project.org/package=MPN>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {MPN: Most Probable Number and Other Microbial Enumeration Techniques},
    author = {Martine Ferguson and John Ihrie},
    year = {2026},
    note = {R package version 0.5.0},
    url = {https://CRAN.R-project.org/package=MPN},
  }