To cite careless in publication use:

Yentes R.D., & Wilhelm, F. (2018). careless: Procedures for computing indices of careless responding.R package version 1.1.3.

Corresponding BibTeX entry:

  @Manual{,
    title = {careless: Procedures for computing indices of careless
      responding},
    author = {Richard D. Yentes and Francisco Wilhelm},
    year = {2018},
    note = {R package version 1.1.3},
  }