To cite package ‘CAs’ in publications use:

  Groemping U (2026). _CAs: Creating Covering Arrays_. R package
  version 0.24-4, <https://github.com/ugroempi/cas>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {CAs: Creating Covering Arrays},
    author = {Ulrike Groemping},
    year = {2026},
    note = {R package version 0.24-4},
    url = {https://github.com/ugroempi/cas},
  }