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.

Corresponding BibTeX entry:

  @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},
  }