To cite package ‘kuniumi’ in publications use:

  Uryu S (2024). _kuniumi: Load and Handles Geo-Spatial Data on Japan's
  National Land_. R package version 0.0.0.9000,
  <https://github.com/uribo/kuniumi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {kuniumi: Load and Handles Geo-Spatial Data on Japan's National Land},
    author = {Shinya Uryu},
    year = {2024},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/uribo/kuniumi},
  }