To cite package ‘CNID’ in publications use:

  Chu X (2023). _CNID: Get Basic Information from Chinese ID Number_. R
  package version 1.3.1, <https://gitlab.com/chuxinyuan/cnid>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {CNID: Get Basic Information from Chinese ID Number},
    author = {Xinyuan Chu},
    year = {2023},
    note = {R package version 1.3.1},
    url = {https://gitlab.com/chuxinyuan/cnid},
  }