To cite package ‘rethnicity’ in publications use:

  Xie, Fangzhou (2022). “Rethnicity: An R Package for Predicting
  Ethnicity from Names.” _SoftwareX_, *17*, 100965. ISSN 2352-7110,
  doi:10.1016/j.softx.2021.100965
  <https://doi.org/10.1016/j.softx.2021.100965>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Rethnicity: An {R} Package for Predicting Ethnicity from Names},
    shorttitle = {Rethnicity},
    author = {{Xie} and {Fangzhou}},
    year = {2022},
    journal = {SoftwareX},
    volume = {17},
    pages = {100965},
    issn = {2352-7110},
    doi = {10.1016/j.softx.2021.100965},
    copyright = {All rights reserved},
    langid = {english},
    abbr = {SoftwareX},
  }