To cite bartMachine/bartMachineJARs in publications use:

  Adam Kapelner, Justin Bleich (2016). bartMachine: Machine Learning
  with Bayesian Additive Regression Trees. Journal of Statistical
  Software, 70(4), 1-40. doi:10.18637/jss.v070.i04

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{bartMachine}: Machine Learning with {B}ayesian Additive Regression Trees},
    author = {Adam Kapelner and Justin Bleich},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {70},
    number = {4},
    pages = {1--40},
    doi = {10.18637/jss.v070.i04},
  }