To cite in publications use:

Hankin RK (2020). “Introducing the permutations package.” SoftwareX, 11.

Corresponding BibTeX entry:

  @Article{,
    title = {Introducing the permutations package},
    author = {Robin K.S. Hankin},
    journal = {SoftwareX},
    year = {2020},
    volume = {11},
  }