To cite the cubing package please use:

  Stephenson, A. G. (2017). An Introduction to the Cubing Package.
  URL: https://CRAN.R-project.org/package=cubing.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {An Introduction to the Cubing Package},
    author = {A. G. Stephenson},
    year = {2017},
    url = {https://CRAN.R-project.org/package=cubing},
  }

Good job. Have a great day.