To cite package lifecontingencies in publications use:

Giorgio Alfredo Spedicato. Lifecontingencies. An R package to perform life contingencies actuarial mathematics

Corresponding BibTeX entry:

  @Manual{,
    title = {Lifecontingencies: an R package to perform life
      contingencies actuarial mathematics},
    author = {Giorgio Alfredo Spedicato},
    month = {04},
    year = {2012},
    note = {R package version 0.9.2},
  }