To cite nauf in publications use:

Eager, Christopher D. (2017). nauf: Regression with NA Values in Unordered Factors. R package version 1.1.0. https://CRAN.R-project.org/package=nauf

Corresponding BibTeX entry:

  @Manual{,
    title = {nauf: Regression with NA Values in Unordered Factors},
    author = {Christopher D. Eager},
    year = {2017},
    note = {R package version 1.1.0},
    url = {https://CRAN.R-project.org/package=nauf},
  }