To cite package ‘zipangu’ in publications use:

  Uryu S (2024). _zipangu: Japanese Utility Functions and Data_. R
  package version 0.3.2.9000, , <https://github.com/uribo/zipangu>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {zipangu: Japanese Utility Functions and Data},
    author = {Shinya Uryu},
    year = {2024},
    note = {R package version 0.3.2.9000, },
    url = {https://github.com/uribo/zipangu},
  }