To cite package ‘fun’ in publications use:

  Xie Y, Qiu Y, Wei T (2024). _fun: Use R for Fun_. R package version
  0.3.1, <https://github.com/yihui/fun>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fun: Use R for Fun},
    author = {Yihui Xie and Yixuan Qiu and Taiyun Wei},
    year = {2024},
    note = {R package version 0.3.1},
    url = {https://github.com/yihui/fun},
  }