To cite package ‘vimpact’ in publications use:

  Li X (2025). _vimpact: Vaccine Impact Calculation_. R package version
  0.1.6, <https://github.com/vimc/vimpact>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {vimpact: Vaccine Impact Calculation},
    author = {Xiang Li},
    year = {2025},
    note = {R package version 0.1.6},
    url = {https://github.com/vimc/vimpact},
  }