To cite partools in publications use:

Matloff N (2016). “Software Alchemy: Turning Complex Statistical Computations into Embarrassingly-Parallel Ones.” Journal of Statistical Software, 71(4), 1–15. doi:10.18637/jss.v071.i04.

Corresponding BibTeX entry:

  @Article{,
    title = {Software Alchemy: Turning Complex Statistical Computations
      into Embarrassingly-Parallel Ones},
    author = {Norman Matloff},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {71},
    number = {4},
    pages = {1--15},
    doi = {10.18637/jss.v071.i04},
  }