To cite package ‘cowsay’ in publications use:

  Chamberlain S, Dobbyn A (2024). _cowsay: Messages, Warnings, Strings
  with Ascii Animals_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=cowsay>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {cowsay: Messages, Warnings, Strings with Ascii Animals},
    author = {Scott Chamberlain and Amanda Dobbyn},
    year = {2024},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=cowsay},
  }