To cite nombre in publications use:

Hayes R, Alexander (2020). nombre: number names. R package version 0.1.0, https://github.com/rossellhayes/nombre.

Corresponding BibTeX entry:

  @Manual{,
    title = {nombre: number names},
    author = {Rossell Hayes and {Alexander}},
    year = {2020},
    note = {R package version 0.1.0},
    url = {https://github.com/rossellhayes/nombre},
  }