To cite package ‘jpcity’ in publications use:

  Uchida M (2024). _jpcity: Read and Convert Japanese Municipality
  Codes_. R package version 0.3.0, ,
  <https://github.com/uchidamizuki/jpcity>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {jpcity: Read and Convert Japanese Municipality Codes},
    author = {Mizuki Uchida},
    year = {2024},
    note = {R package version 0.3.0, 
},
    url = {https://github.com/uchidamizuki/jpcity},
  }