To cite package 'rela' in publications use:

Chajewski, M. (2009). rela: Scale item analysis. R package version 4.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {rela: Scale item analysis},
    author = {Michael Chajewski},
    year = {2009},
    note = {R package version 4.1},
  }