To cite package ‘vietnamcode’ in publications use:

Le A (2016). vietnamcode: Convert Vietnam Provincial Codes. R package version 0.1.1, https://CRAN.R-project.org/package=vietnamcode.

Corresponding BibTeX entry:

  @Manual{,
    title = {vietnamcode: Convert Vietnam Provincial Codes},
    author = {Anh Le},
    year = {2016},
    note = {R package version 0.1.1},
    url = {https://CRAN.R-project.org/package=vietnamcode},
  }