To cite package ‘rfriend’ in publications use:

  van Delden S (2026). _rfriend: Provides Batch Functions and
  Visualisation for Basic Statistical Procedures_. R package version
  3.1.0, <https://github.com/delde001/rfriend>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rfriend: Provides Batch Functions and Visualisation for Basic Statistical
Procedures},
    author = {Sander H. {van Delden}},
    year = {2026},
    note = {R package version 3.1.0},
    url = {https://github.com/delde001/rfriend},
  }