To cite package ‘hchinamap’ in publications use:

  Cheng Z (2019). _hchinamap: Mapping China and Its Provinces_. R
  package version 0.1.0,
  <https://CRAN.R-project.org/package=hchinamap>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {hchinamap: Mapping China and Its Provinces},
    author = {Zhenxing Cheng},
    year = {2019},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=hchinamap},
  }