To cite package ‘bitops’ in publications use:

  Dutky S, Maechler M (2024). _bitops: Bitwise Operations_. R package
  version 1.0-8, <https://github.com/mmaechler/r-bitops>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {bitops: Bitwise Operations},
    author = {Steve Dutky and Martin Maechler},
    year = {2024},
    note = {R package version 1.0-8},
    url = {https://github.com/mmaechler/r-bitops},
  }