To cite package ‘vietnamcode’ in publications use:

  Le A (2026). _vietnamcode: Convert Vietnam Provincial Codes_. R
  package version 0.1.1,
  <https://github.com/cranhaven/cranhaven.r-universe.dev>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {vietnamcode: Convert Vietnam Provincial Codes},
    author = {Anh Le},
    year = {2026},
    note = {R package version 0.1.1},
    url = {https://github.com/cranhaven/cranhaven.r-universe.dev},
  }