To cite VIM in publications use:

  Alexander Kowarik, Matthias Templ (2016). Imputation with the R
  Package VIM. Journal of Statistical Software, 74(7), 1-16.
  doi:10.18637/jss.v074.i07

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Imputation with the {R} Package {VIM}},
    author = {Alexander Kowarik and Matthias Templ},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {74},
    number = {7},
    pages = {1--16},
    doi = {10.18637/jss.v074.i07},
  }
