To cite package ‘washoku’ in publications use:

Uryu S (2022). washoku: Extra 'recipes' for Japanese Text, Date and Address Processing. R package version 0.0.0.9000, https://github.com/uribo/washoku.

Corresponding BibTeX entry:

  @Manual{,
    title = {washoku: Extra 'recipes' for Japanese Text, Date and
      Address Processing},
    author = {Shinya Uryu},
    year = {2022},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/uribo/washoku},
  }