To cite lifecontingencies in publications use:

Giorgio Alfredo Spedicato (2013). The lifecontingencies Package: Performing Financial and Actuarial Mathematics Calculations in R. Journal of Statistical Software, 55(10), 1-36. URL http://www.jstatsoft.org/v55/i10/.

Corresponding BibTeX entry:

  @Article{,
    title = {The {lifecontingencies} Package: Performing Financial and
      Actuarial Mathematics Calculations in {R}},
    author = {Giorgio Alfredo Spedicato},
    journal = {Journal of Statistical Software},
    year = {2013},
    volume = {55},
    number = {10},
    pages = {1--36},
    url = {http://www.jstatsoft.org/v55/i10/},
  }