To cite package ‘vita’ in publications use:

  Celik E (2015). _vita: Variable Importance Testing Approaches_. R
  package version 1.0.0, <https://CRAN.R-project.org/package=vita>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {vita: Variable Importance Testing Approaches},
    author = {Ender Celik},
    year = {2015},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=vita},
  }