To cite package ‘sitmo’ in publications use:

  Balamuta J, van den Berg T (2021). _sitmo: Parallel Pseudo Random
  Number Generator (PPRNG) 'sitmo' Header Files_. R package version
  2.0.2, <https://CRAN.R-project.org/package=sitmo>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {sitmo: Parallel Pseudo Random Number Generator (PPRNG) 'sitmo' Header
Files},
    author = {James Balamuta and Thijs {van den Berg}},
    year = {2021},
    note = {R package version 2.0.2},
    url = {https://CRAN.R-project.org/package=sitmo},
  }