To cite demofit in publications:

  Li J (2026). _demofit: Parametric Mortality Curve Fitting and
  Mortality Forecasting Tools_. R package version 0.1.3,
  <https://CRAN.R-project.org/package=demofit>.

A BibTeX entry for LaTeX users is

  @Manual{Li2026demofit,
    title = {demofit: Parametric Mortality Curve Fitting and Mortality Forecasting Tools},
    author = {Jackie Li},
    year = {2026},
    note = {R package version 0.1.3},
    url = {https://CRAN.R-project.org/package=demofit},
  }