To cite package ‘xutils’ in publications use:

Xie F (2021). xutils: Utility Functions of Fangzhou Xie. R package version 0.0.2, https://github.com/fangzhou-xie/xutils.

Corresponding BibTeX entry:

  @Manual{,
    title = {xutils: Utility Functions of Fangzhou Xie},
    author = {Fangzhou Xie},
    year = {2021},
    note = {R package version 0.0.2},
    url = {https://github.com/fangzhou-xie/xutils},
  }