To cite package ‘finalsize’ in publications use:

  Gupte P, Van Leeuwen E, Kucharski A (2024). _finalsize: Calculate the
  Final Size of an Epidemic_. R package version 0.2.1.9000, ,
  <https://github.com/epiverse-trace/finalsize>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {finalsize: Calculate the Final Size of an Epidemic},
    author = {Pratik Gupte and Edwin {Van Leeuwen} and Adam Kucharski},
    year = {2024},
    note = {R package version 0.2.1.9000, 
},
    url = {https://github.com/epiverse-trace/finalsize},
  }