To cite pre in publications use:

  Fokkema M (2020). “Fitting Prediction Rule Ensembles with R Package
  pre.” _Journal of Statistical Software_, *92*(12), 1-30.
  doi:10.18637/jss.v092.i12 <https://doi.org/10.18637/jss.v092.i12>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Fitting Prediction Rule Ensembles with {R} Package {pre}},
    author = {Marjolein Fokkema},
    journal = {Journal of Statistical Software},
    year = {2020},
    volume = {92},
    number = {12},
    pages = {1--30},
    doi = {10.18637/jss.v092.i12},
  }