To cite simcausal in publications use:

  Sofrygin O, van der Laan MJ, Neugebauer R (2017). “simcausal R
  Package: Conducting Transparent and Reproducible Simulation Studies
  of Causal Effect Estimation with Complex Longitudinal Data.” _Journal
  of Statistical Software_, *81*(2), 1-47. doi:10.18637/jss.v081.i02
  <https://doi.org/10.18637/jss.v081.i02>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{simcausal} {R} Package: Conducting Transparent and Reproducible Simulation Studies of Causal Effect Estimation with Complex Longitudinal Data},
    author = {Oleg Sofrygin and Mark J. {van der Laan} and Romain Neugebauer},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {81},
    number = {2},
    pages = {1--47},
    doi = {10.18637/jss.v081.i02},
  }