To cite simsalapar in publications use:

Hofert M, M├Ąchler M (2016). “Parallel and Other Simulations in R Made Easy: An End-to-End Study.” Journal of Statistical Software, 69(4), 1–44. doi: 10.18637/jss.v069.i04.

Corresponding BibTeX entry:

  @Article{,
    title = {Parallel and Other Simulations in {R} Made Easy: An
      End-to-End Study},
    author = {Marius Hofert and Martin M\"achler},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {69},
    number = {4},
    pages = {1--44},
    doi = {10.18637/jss.v069.i04},
  }