To cite fastnet in publications use:

Dong X, Castro L, Shaikh N (2020). “fastnet: An R Package for Fast Simulation and Analysis of Large-Scale Social Networks.” Journal of Statistical Software, 96(7), 1–23. doi: 10.18637/jss.v096.i07.

Corresponding BibTeX entry:

  @Article{,
    title = {{fastnet}: An {R} Package for Fast Simulation and Analysis
      of Large-Scale Social Networks},
    author = {Xu Dong and Luis Castro and Nazrul Shaikh},
    journal = {Journal of Statistical Software},
    year = {2020},
    volume = {96},
    number = {7},
    pages = {1--23},
    doi = {10.18637/jss.v096.i07},
  }