To cite package ‘udunits2’ in publications use:

Hiebert J (2025). udunits2: Udunits-2 Bindings for R. R package version 0.13.2.2, https://CRAN.R-project.org/package=udunits2.

Corresponding BibTeX entry:

  @Manual{,
    title = {udunits2: Udunits-2 Bindings for R},
    author = {James Hiebert},
    year = {2025},
    note = {R package version 0.13.2.2},
    url = {https://CRAN.R-project.org/package=udunits2},
  }