To cite 'simmer' in publications use:

  Ucar I, Smeets B, Azcorra A (2019). “simmer: Discrete-Event
  Simulation for R.” _Journal of Statistical Software_, *90*(2), 1-30.
  doi:10.18637/jss.v090.i02 <https://doi.org/10.18637/jss.v090.i02>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{simmer}: Discrete-Event Simulation for {R}},
    author = {I{\~n}aki Ucar and Bart Smeets and Arturo Azcorra},
    journal = {Journal of Statistical Software},
    year = {2019},
    volume = {90},
    number = {2},
    pages = {1--30},
    doi = {10.18637/jss.v090.i02},
  }

If appropriate, use also:

  Ucar I, Hernández J, Serrano P, Azcorra A (2018). “Design and
  Analysis of 5G Scenarios with simmer: An R Package for Fast DES
  Prototyping.” _IEEE Communications Magazine_, *56*(11), 145-151.
  doi:10.1109/MCOM.2018.1700960
  <https://doi.org/10.1109/MCOM.2018.1700960>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Design and Analysis of 5G Scenarios with {simmer}: An {R} Package for Fast DES Prototyping},
    author = {I{\~n}aki Ucar and José Alberto Hernández and Pablo Serrano and Arturo Azcorra},
    journal = {IEEE Communications Magazine},
    year = {2018},
    month = {November},
    volume = {56},
    number = {11},
    pages = {145--151},
    doi = {10.1109/MCOM.2018.1700960},
  }