To cite package ‘lifecontingencies’ in publications use:

  Spedicato G (2013). “The lifecontingencies Package: Performing
  Financial and Actuarial Mathematics Calculations in R.” _Journal of
  Statistical Software_, *55*(10), 1-36.
  <https://www.jstatsoft.org/v55/i10/>.

A BibTeX entry for LaTeX users is

  @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 = {https://www.jstatsoft.org/v55/i10/},
  }