To cite EZtune in publications use:

  Jill Lundell (2017). There has to be an easier way: a simple
  alternative for parameter tuning of supervised learning methods. JSM
  Proceedings, Statistical Computing Section. Alexandria, VA: American
  Statistical Association, 3028--3036.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {There has to be an easier way: a simple alternative for parameter tuning of supervised learning methods},
    author = {Jill F Lundell},
    journal = {JSM Proceedings, Statistical Computing Section. Alexandria, VA: American Statistical Association},
    year = {2017},
    pages = {3028--3036},
  }